djjeff,
I knew Don very well for many years before his death and we would spend hours discussing the Manchester Regiment's badges, and history.
He always had a large collection of militaria, mostly badges, for many Lancashire regiments throughout his collecting career, selling each off to fund the next.
He stopped collecting to the Manchester Regiment in 2003, selling his badges then.
He started to collect Scottish badges for the last 10 years of his life.
He may have had some Manchester bits of ephemera amongst his papers at the time of his tragic and untimely death, but I never saw the said menu.
I would imagine that he disposed of it between 1994 when the Steadman book was published and before 2003.
sorry.
regards