Thanks for your help guys, It looks like all of the above problems - oil seal, starter, u joints etc.
I rely on the boatyard to maintain my boat and they suggested I change the bellows this year but when they went to do it they discovered that they had already split - probably months ago but as the boat was out of the water there were no warning bells for me so it went unnoticed.
It looks like the water has caused extensive damage particurlary as the problem wasn't discovered for months.
Let this be a lesson to others, don't rely on others to look out for your maintenance issues - read & understand the owners manual and do carry out the recommended checks and replacements.
I had never even looked at the bellows, didn't know what they were! but looking at how obviously deteriorated they are now, had I taken a simple look at them I would have realised how worn they were and would have changed them immediately!
Do your homework, dont rely on others!!! aaaarghhhhhhhhhhhh....................