The late Dennis Thomas in his shop in Walcot Street, Bath in the 60's

 Joke

A motorcycle mechanic was removing a cylinder-head from the engine when he spotted a well-known cardiologist in his shop. 

The cardiologist was there waiting for the service manager to come and take a look at his bike when the mechanic shouted across the garage, 'Hey Doc, want to take a look at this?' The cardiologist, a bit surprised, walked over to where the mechanic was working on the motorcycle. 

The mechanic straightened up, wiped his hands on a rag and asked, 'So Doc, look at this engine. I opened its heart, took the valves out, repaired any damage, and then put them back in, and when I finish it works just like new. So how come I make £40,000 a year and you make £120,000 when you and I are doing basically the same work?' 

The cardiologist paused, leaned over, and then whispered to the mechanic.....
'Try doing it with the engine running'.