Thanks for all the replies, I have a 10 speed Carbony that I could temporarily transplant to try now you good chaps have said 11 is possible.
Good point about the front mech as my 531 does have a front mech braze on tab, but I would probably go 36/52 so hopefully not an issue.
Will be getting the frames refinished so can get Argos Cycles to straighten the rear drop out if needed.
Now is it just me or do highly polished parts that were once a dull anodised finish look odd. Probably me, as I like to remember components as they were originally rather than looking like polished steel.
although I have been given a Cinelli 1R stem where a previous owner has had the bike upside down on the pavement so it’s scratched.