The dispute had centred around three demands; rest breaks, settlements for longstanding personal cases and the reinstatement of a member.
Security guards in parliament celebrated tonight after last ditch talks with the House of Commons Commission resolved their industrial dispute.
PCS will now suspend the planned industrial action tomorrow following the successful talks.
Mark Serwotka said: “This is a significant victory for our security guards. It proves that strong trade union organisation and negotiation brings results.”