STRIKING NHS workers employed by private contractor ISS concluded their four-day strike by marching to the firm’s headquarters in Canary Wharf today.

More than 300 workers, employed as domestics, porters and catering staff at two trusts — Croydon NHS and South London and Maudsley NHS — had walked out over pay, terms and conditions.

Speaking from the picket, GMB membership development officer Helen O’Connor told the Star: “Our message to Croydon NHS and South London is — stop outsourcing.