I currently have bar end shifters which I'd like to replace with brake leaver type shifters. This is a comfort thing rather than it needing to be done. The crank at the front and bottom bracket are totally worn and would probably need replacing, the pedals both broken (lost ball bearings) would also need replacing. I guess that if the front bits are replaced then the back will have to be as well?????
I don't have the tools or knowledge to approach this project myself so am looking for a decent bike shop in the (north?) London area. My budget is NOT bottomless and would like to get this done for the least amount possible but still getting a quality service.
So....
Would I be better sourcing the parts in sales then getting them fitted OR getting the bike shop to do everything? I rather like the look of Campagnolo but can't see what would work well with a tourer rather than a racer!
Can anyone recommend a good value honest bike shop in London? I've had experience of 2 well known chains and both times I came away feeling ripped off

Any other advice would be greatly appreciated!

Indy.....