“DANGEROUS and foolish” London Mayor Boris Johnson was in the firing line yesterday after he shelved the September launch of all-night London Underground trains.

Four Tube lines were due to start running throughout Friday and Saturday nights from September 12, but the mayor has been locked in dispute with unions over new rosters.

London Underground (LU) managing director Nick Brown said that bosses had agreed to defer the launch as they were “not far from an agreement” with workers.