I found a listing for "as right as ninepence" at http://www.shu.ac.uk/web-admin/phrases/list/

"Curiously, this expression and 'as nice as ninepence' are unrelated. The ninepence here referring to the silver ninepenny pieces that were in common use in England until 1696." Mr Bingley and I remember them well.

I didn't see a reference for "bent as a nine bob note" though!