Green’s Dictionary of Slang

bended knees n.

cheese.

1960		J. Franklyn Dict. of Rhy. Sl. 38/1: bended knees Cheese. Probably late 19C. tramps’ slang.
1981		P. Wright Cockney Dialect and Sl. 103: bended knees ‘cheese’.
1992		R. Puxley Cockney Rabbit.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.