Demonstrations are being organised across the country against plans by eight major contractors to quit the industry’s long-standing JIB agreement.

Leaders of Unite said protests will be held in London, Manchester and Newcastle.

In London demonstrators will target Crown House’s job at Farringdon Station.

In Manchester the focus will be on the MediaCity UK where NG Bailey and Crown House are working while in Newcastle rank-and-file sparks will demonstrate outside the Newcastle University site where Balfour Beatty is working.

Unite London regional officer, Guy Langston said: “Our members are furious about this attack by these so-called reputable companies aimed at reducing our members’ income by up to a third.

“The companies are trying to bulldoze their plans through by ripping long-standing national agreements without any negotiation.

“These rogue employers should pull back from the brink as their brutal onslaught on workers’ skills, pay, and terms and conditions is causing widespread anger among workers.”

The employers have dismissed claims that M&E workers will suffer lower pay and conditions under the changes.