I had a top class lesson in doing an oil change on the beast today and feel empowered as I'll no longer have to wonder how good a job has been done as I'll be doing it myself from now on.
Big THANKS to GSIfan (Paul), wjo provided the lesson and the tools necessary to do the job. He is a star!!
however I did spill some and hope not to many gulls die as a result!!!! Bt the beast sounds so much better now the tar is out and fresh stuff is in.