Green’s Dictionary of Slang

a bed-sitting room.

1962		R. Hauser Homosexual Society 91: You can’t face the old life of £6 5s. 0d. a week and chipped plates in the bed-sitter.
1989		M. Amis London Fields 50: Sometimes, when he stumbled into her bedsit in the small hours, Analiese was not alone.
1999		K. Sampson Powder 50: Most bands start to wonder why they’re still living in a bedsit.
2000		Guardian Weekend 15 Jan. 77: I think the Professor of Entrepreneurship won’t be living in a bedsit in his auntie’s house.