The flagship demonstration against government cuts is the March for the Alternative – organised by the Trades Union Congress (TUC) on Saturday 26 March.
Live updates from the march have been posted on this page. Scroll to the bottom to see earlier posts. We were also tweeting from the march, with updates including our location and key events, using the hashtags #pcs26 and #26march.
17:00 - Well that's it for the day, an excellent turnout and huge thanks to all PCS members for attending. Safe journey home all.
16:36 - Richard Evans our Walk2march hero is introduced by Brendan Barber to big cheers.
16:27 - Richard Evans, our Walk2march hero is going to be imminently introduced at the Hyde Park stage by Brendan Barber, TUC general secretary. Huge congratulations and admiration well deserved for Richard.
16:20 - Woodcraft folk, an educational movement for children and young people just passed by the PCS contingent too. Still all in good spirits at Hyde Park.
16:11 - New pic added of the PCS stall at Hyde Park to the PCS photostream on flickr.
16:03 - The Easington brass band raise a smile off everyone as they march up Piccadilly with the RMT main contingent.
15:59 - We're just hearing that the march and rallies taking place today in Belfast and Derry were also a great success. Thousands took to the streets to demonstrate their anger at the governments cuts agenda, a great show again, well done all.
15:53 - UK Uncut feeder march has now joined up with the marchers too.
15:42 - The Guardian's afternoon round up is now estimating the number of marchers at half a million!
15:37 - Welcome to Hyde park PCS marchers! You made it! Delays caused today by such a big turnout, but excellent to see all here, and a great turnout by PCS.
15:24 - Some very good giant puppets of Thatcher and Cameron just passed by the PCS contingent. Good work.
15:20 - A reminder that the PCS stall is by speakers corner in Hyde Park. Visit us for the latest leaflets and flyers (like our alternative booklet) and other useful PCS resources.
15:11 - BBC news article on the march says more than 200,000, Guardian has it at 400,000, either way it's a biggie. Well done all, a wonderful turnout.
15:04 - Mark Serwotka calling for striking together and for Philip Green to pay his taxes gets the biggest cheers yet today.
14:59 - Mark Serwotka - 'Let's be sure we strike together to make the government listen'.
14:58 - PCS general secretary Mark Serwotka speaking at Hyde Park - 'We must oppose every single cut. Defend every pensioner, every worker, every student.
14:48: Some people are gathering in Trafalgar Square where there are big banners reading 'Strike like an Egyptian' and 'We demand regime change'. Two girls in yellow hard hats are offering free hugs as part of what they call the 'Kindness offensive'.
14:42 - Five minute countdown to PCS general secretary Mark Serwotka speaking in Hyde Park.
14:40 - Good gallery on the BBC site of the march.
14:30 - Zac Moon 5 months old, worried about Hackney cuts to children services. It's his first march.
14:29 - The last marchers have just passed Embankment tube, where the march started.
14:20 - PCS general secretary Mark Serwotka is in the park, will be speaking soon.
14:17 - East Kilbride Revenue and Customs have just passed Embankment tube. The end of the march is 100 yards behind them.
14:12 - PCS land registry Nottingham branch banner has just passed Embankment tube, closely followed by Exeter RPA branch.
14:07 - PCS Anglia branch banner just passed Embankment tube two hours after most of their union colleagues. And the end of the march is in sight by Blackfriars bridge.
14:02 - There is still a never ending sea of people passing under the foot bridge by Embankment tube. A random selection of banners include Dorchester Labour Party, Dudley Unison, and Bristol University UCU union branch.
13:59 - No word as yet on official numbers, amounts vary from 200,000 up to 450,000. Either way, an excellent turnout today. Well done all.
13:56 - Fran Quinn from Runcorn in Cheshire, marching with the PCS education group banner in the huge crowds a long way behind the main PCS contingent said: 'I hope the turnout is spectacular because we need to tell this Tory government that we won't lie down and take their cuts to our public services'.
13:52 - There's a large Latin American union group taking part in the march today too.
13:41 - Jeremy Dear, general secretary of the National Union of Journalists and a member of the Trade Union Congress's ruling general council said 'this is a bigger demonstration that anyone dared to dream. It is a great launchpad for co-ordinated industrial action against the cuts and attacks on working conditions across the public and private sectors'.
13:38 - No confirmed numbers as of yet, but seems to be approx 300,000 to 450,000 from police reports. A fantastic showing.
13:17 - No problems reported by PCS marchers so far, progress is slow in getting to the park, but a great turnout and huge crowds has caused delays.
13:12 - The pavements near the Embankment are now full of marchers too. That's on top of both sides of a wide road.
13:08 - 58 PCS banners in the union's main contingent which is just reaching parliament. Well done all.
13:02 - The Morris dancer liberation group is on the march. It's a very varied and mixed crowd and all in good spirits.
13:00 - The front of the march is at Hyde Park, PCS marchers will be there soon, huge crowds are making progress very slow.
12:50 - By the clock on Big Ben, the big PCS balloon hasn't reached the Houses of Parliament yet. Progress is slow because the crowds are huge.
12:44 - Good to see plenty of PCS flags and placards among other union groups passing too.
12:42 - Manchester NUT vice chair Melanie Crossman said 'I'm thrilled to bits with the turnout. It shows the breadth of opposition to the cuts. There are lots of people here who are not political and do not go on demonstrations. We teach children from deprived areas and they have no chance of going to university under the new system. It's not about ability, it's about ability to pay.'
12:40 - Determination to raise awareness about the alternative to the cuts kept PCS member Richard Evans going on his 166-mile walk this week just to get to the start of the march. 'The support and encouragement I got along the way was incredible. At times I didn't think I was going to make it but that support kept me going. I walked to try and encourage others to join me and show that there is an alternative. Hopefully we'll convince the government to think again about cuts to vital public services'.
12:38 - Lorraine is off the bus, and marching with us! If you haven't already done so, watch the fantastic video of Lorraine spreading the word about the march.
12:34 - Some great creative slogans, posters and banners at the march, well done all, a fantastic turnout from PCS members of course too.
12:26 - The National union of teachers are marching behind a massive pair of inflatable scissors bearing the slogan 'education cuts never heal'.
12:24 - Reports that the Police estimate there being around 450,000 marchers. Whatever the amount, it's clearly a great turnout, well done all.
12:22 - Front of march is now at Piccadilly circus.
12:14 - A constant stream of marchers have been passing over Waterloo bridge from the south bank for the part hour. It's not on the official route but they have the banners in the air. Including one from a PCS branch.
12:10 - As the march moved off slowly, eight year old Andrew Miles was leading the chanting as he sat on his Dad's shoulders clapping with his inflatable PCS sticks. Dad Peter and Mum Lindsay work in Birmingham job centres. Andrew's brothers Owen, 13 and Rhys, 7 are also on the march.
12:07 - Lots of marchers wearing our PCS march for the alternative badges. Good stuff.
11.59 - PCS marchers are on the move, with PCS rep Richard Evans marching under the banner, having finished his 166 mile walk. Congratulations and huge thanks Richard. An inspiration to all.
11:53 - There are more than thirty PCS banners lined up by Waterloo bridge. Well done all.
11:40 - A reminder that the PCS stall is by speakers corner in Hyde Park. Visit us for the latest leaflets and flyers (like our alternative booklet) and other useful PCS resources.
11:27 - Marchers are lining up across Waterloo Bridge in readiness for the march to Hyde Park.
11:21 - Lots of wellwishers to the PCS contingent at Piccadilly circus in favour of the march, and opposed to cuts.
11:20 - There's a deafening combination of vuvuzelas under Waterloo bridge and helicopters over it.
11:19 - PCS London courts branch banner is just arriving.
11:16 - 'Osborne's cuts are fair if pigs can fly' reads one colourful t-shirt of a marcher waiting to move off.
11:13 - More PCS banners on display from DWP Sheffield, Revenue and Customs group, Portsmouth Ministry of Defence and Group 48.
11:11 - One of the youngest marchers is 13-month-old Rosa from Wanstead whose parents Dave and Liza are marching to save vital services such as Surestart and in defence of public services.
11:05 - Alan Dowling, a PCS member from the UK border agency in Sheffield is attending his first ever PCS demo. He said: 'it is ridiculous that people are being made redundant when we have a backlog of work. They are being thrown onto the dole when there are no jobs in the private sector'.
11:01 - If you haven't already, why not watch Lorraine on the bus spreading the word about the demonstration - this has been viewed more than 8,000 times on youtube
10:56 - The march move forward about 50 yards, and then stops. Looks like it's a false start.
10:54 - PCS banners on the Embankment include DWP Liverpool and Scotland.
10:52 - Article on the guardian website on PCS rep Richard Evans 166 mile walk to the March. You can Follow Richard's progress as he finishes his walk on Twitter using #Walk2March.
10:46 - PCS placards include 'No justice in cuts', 'There is an alternative...close the £120billion pound tax gap' 'There is an alternative...invest in housing and transport'.
10:34 - Ten coaches from Derby have just arrived at the Wembley coach park. Organised by Unite, Unison and the National Union of Teachers.
10:33 - The Prison Officers Association delegation in bright yellow t-shirts are lined up in front of the PCS contingent.
10:28 - PCS Scotland banner is on the Embankment by Waterloo bridge.
10:27 - Met Police group president Richard Rooney said the march shows 'we've had enough' and that the union movement had woken up to fight back. 'Many police officers our sympathetic to our view and feeling the pinch too.'
10:25 - Third local PCS banner unfurled on the Embankment is Aberdeen Town Committee branch. They came down on the sleeper.
10:21 - Noisy contingent from GMB union branch march to assembly point blowing orange vuvuzelas.
10:19 - Second local PCS banner unfurled on the Embankment is Met Police London branch.
10:17 - The PCS stall is setting up by speakers corner in Hyde Park. The stall will have our latest leaflets and flyers (like our alternative booklet), clappers, ponchos and lots of other interesting PCS resources you can use at the march.
10:15 - First local PCS banner unfurled on the Embankment is Cornwall, Devon and Somerset branch. They came down on the sleeper.
10:12 - Chartered Society of Physiotherapists are handing out green 'protect your local NHS' stickers to passers by on the Embankment.
10:09 - Unite inflatables with red and white markings also on display.
10:03 - Purple and green Unison inflatables are bobbing in the wind at the front of the assembly area on the embankment.
10:00 - We're hoping to add videos from the march to the site as and when we can. The guardian are also uploading vids to from marchers, details on the site.
09:58 - Our massive yellow PCS balloon is at embankment, see for yourself at our flickr page.
09:52 - PCS calculated figure of £120billion pounds of tax evaded, avoided or uncollected being quoted by speaker with megaphone across the road from parliament.
09:46 - By the clock on Big Ben. There are three TV trucks on Westminster bridge ready to cover the demonstration which starts a few hundred yards to the east.
09:42 - Lots of coaches of demonstrators reported at Newport Pagnall station on the M1 as sun breaks through cloud over central London.
9.37 - Some London radio stations have been saying this morning that Westminster bridge is closed. In fact, it is open. Police on the bridge say it will be closed from 10.30 to traffic, but will stay open for pedestrians. Buses that usually cross Westminster bridge are already stopping short on both sides.
9.34 - For those yet to set off, please remember the practical stuff before you leave. And, for reading material for the trip, why not download our alternative leaflet to print off and read
You can also find lots of other good resources such as flyers to download from our march page.
09:25 - Marchers are also using scheduled transport to reach London. A group with yellow PCS flags were spotted boarding the 7.3oam train from Leeds to Kings Cross, London.
09:22 - Hundreds of coaches and trains are bringing demonstrators to London from all over Britain. Unions have been working well together with white Unite whistles handed out on the 6.20am National Union of Teachers' train from Manchester.
09:17 - Mobile networks permitting, we will be uploading pics to the PCS flickr page. Check out some of the images already there, including our recent projections on to various buildings in the capital.
08:59 - PCS rep Richard Evans will be setting off from Hounslow this morning, completing the final leg of a 166-mile walk. Congratulations, and thank you Richard. Will see you there. You can Follow Richard's progress as he finishes his walk on Twitter using #Walk2March.
08:50 - From marchers attending from Liverpool - Lime Street really busy, great vibe, everyone up for a great day. Good stuff, see you soon!
08:40 - The BBC are reporting that around 100,00 people are likely to attend the march (as predicted by the TUC), while the Guardian has the figure at up to 300,000. Either way, it's going to be a big turn out today, best wishes to all marching. To all PCS members, see you on the Embankment, assembly point 6.
08:25 - People with banners getting off the train at Waterloo. Embankment lined with union placard and banners already.