Nils,
I grew up in Chichester in the 1970's and hung around until
the mid 1980's. There was only one speed shop that I knew
of - Harry Tillman Speed Shop. They are in Aston PA. I
know they are still there. Ask for Harry. He may remember
this guy. Oddly enough, Harry recently told me about an
L/78 that came from it's original car and the owner still
was debating selling it. Wonder if it's the same engine?
Let me know how you make out.
Steve