Thanks every one for their help, anyway I went shopping yesterday and brought oil filter £10-50p.
8 litres of Silkolene pro4 plus 15w50, £100-50p
the oil was more expensive than I expected, if I'de known what I know now I could have got the oil off Ebay £90.
Just need some decent weather over here so that I can take the trike on a decent ride then service it.
Cheers again Guys.
John.