BMW Motorcycles - London

A customer turned up with a running issue on his BMW R80 rt.
BMW couldnt solve the problem without spending loads of money on it.
(ie swapping parts rather than diagnosing the problem)

In desperation he found his way to us.
Three hours later, he left with the problem sorted.

I do love it when we can help people and their bikes.
But why is there such a dearth of good mechanics in London ?