DISCONTENT among agency workers against “endless and relentless” attacks is hitting critical mass across NHS hospitals in London, with staff talking openly about possible strike action.

Inter-staff messages seen by the Star highlight widespread anger over perceived attacks on working conditions by outsourcing company ISS.

The subcontracting giant, which supplies cleaning, catering and security staff to London hospitals, has already been criticised for failing to pay the London Living Wage of £10.55 an hour. Workers also don’t receive immediate sick pay, which staff say is a health risk if people are forced back into hospital work before they’re fully recovered.