Repair Work on Bike Electrics

Has anyone used Motorcycle Surgery in Streatham?
I need some electrical work done as battery not charging.
Have narrowed it down to a prob. with either the regulator/rectifier or the altenator and I am not able to do the work myself. Thanks

Going through this at the moment with one of my bikes, if you can take the side cover off and check if the alternator coils look burnt, that will give you a good clue.