Peter Ward wore no 8 but during Don Revies days at Man City I m sure they played with the centre forward and 2 inside forwards all wearing the no 9. This was known as the Revie Plan.
BHA always played with 5 and 6 as CB in the mid to old days but changed when Gus was manager. No 5 was an Argentinian midfielder, whose names alludes me.Graham Cross wore No 6 when he was with us.