Tilling Group

Tilling, together with the other conglomerate, British Electric Traction (BET), became the main constituents of the country's nationalised bus industry in the late 1960s and was sufficiently well known to have entered popular culture as part of London's Cockney rhyming slang (Thomas Tilling = shilling).
The company continued as an industrial conglomerate after the nationalisation of its bus interests; it was acquired by BTR plc in 1983. Provided by Wikipedia