Well! I took it for a 40 mile trip. No oil leak. I then took it out again and passed the dealer that serviced it. I called in and told them of my woes. They said they would check it out, which they did. They gave me a Bonnie for the next few hours. When I returned they said they had found no leak and returned my bike to me. They said they had done nothing to the bike other than to clean the underneath. When I crawled underneath to take a photo, obviously the bolt with the washer was still there but the washer had gone. I was either mistaken before or I have moved into the twilight zone. Anyway no leak so I can tour Scotland in 5 weeks with peace of mind. PS: The Bonnie was a nice smooth bike, but nothing like the riding experience of the TBird.
Thanks for all your help.