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@Manc_Ronnie
As Nes says, BB would do it, and not many bike shops can complain if you turn up with your own bits. Certainly Withington Cycles never do.
Shimano only have double and triple front mechs in their range, nothing compact specific, so current front mech should work fine. In theory you should get a new chain and cassette, but depending on wear levels of current setup you could be OK.
No idea about Bottom Brackets, that's deffo a mechanic's job.