Green’s Dictionary of Slang

Margaret Thatcher n.

(Irish) a bed.

1996		P. Howard The Joy (2015) [ebook] ‘The Margaret?’ ‘The Margaret Thatcher. The scratcher.’ ‘Oh, the bed. I see’.
2005		P. Howard Curious Incident of the Dog in the Nightdress 7: I’m wrecked. I’m going to hit the old Margaret Thatcher.
2018		I. Welsh Dead Man’s Trousers 43: — Where’s kid sis? Still in the Maggie Thatcher?