Oil leak all sorted........at last. 18 month ago I noticed a few drops of oil on the floor which had been running down the side stand. I looked everywhere for where the leak was coming from and came to the conclusion it was the sump gasket so I changed it but still had a leak. Last summer the leak got worse, investigated again and firstly changed the gear change lever seal, still leaked, so changed the starter motor O ring.......still an oil leak, so changed the sump gasket again as there was always oil along the line of the sump....still leaked, but alot worse now. Only thing left on that side at that level was the oil pump. Took it apart and every O ring was hard, brittle and squashed flat. All new O rings fitted......bingo, dry as a bone at last.