Seven Tube drivers refused to take out trains and were subsequently sent home today.
The District Line drivers claimed that appropriate safety checks weren’t made on the Tube. This caused minor delays on the line.
Unions claim that failure of carrying out checks will increase the chances of the planned Tube strike on 5 August.
Finn Brennan, Aslef union district secretary, said: “London Underground (LU) this morning sent home without pay seven drivers on the District line who refused to bring trains into service that had not been subject to safety checks in line with LU’s own safety standards.
“Passengers will rightly be concerned by the attitude of the company whose determination to force through changes to rosters (for the Night Tube operation and main cause of the strikes) while ignoring safety concerns is exacerbating the current dispute.”