English: Blue Triangle bus T33 (reg. WYV 33T), a 1979 Leyland Titan (B15), pictured on East Finchley High Road, London, while operating a rail replacement service from East Finchley tube station to Camden Town tube station, covering for weekend engineering works on the Northern Line.

The 42nd production Titan, it's from the early batch built by the British Leyland subsidiary Park Royal Vehicles in Park Royal, London (later ones were built at Leyland's expanded factory in the Lillyhall Industrial Estate, Workington). As with the vast majority of production, it was delivered new to London Transport as part of the dual-door T-class, allocated fleet number T33.

As part of the privatisation process, in 1994 it passed into the fleet of Stagecoach East London. In 2001 it was purchased by Blue Triangle, and when that company was taken over by Go-Ahead, T33 was retained by heritage hire specialist The London Bus Company, however it doesn't appear as if it's intended to be operated, being stored and put up for sale.