Victimised Tube workers will take their case to Parliament today after at least one agency cleaner was sacked for refusing to use a biometric fingerprinting system.

Tube union RMT has waged a long-running campaign against contractor ISS’s move to the biometric system of digital time sheets, branding it an attack on civil liberties and a move towards workplace automation.

The union instructed members to boycott the new system after an overwhelming Yes vote for action in a boycott.

A cleaner at Heathrow Terminal 4 Underground station was fired yesterday morning while workers across the network were sent home without pay despite a prior agreement that workers would be allowed to continue using the old system.

Acting RMT general secretary Mick Cash said: “We call on members and supporters to show their opposition to ISS’s appalling bullying tactics by joining the demonstration outside Parliament tomorrow.”

Protesters will gather at 9am at Old Palace Yard.