Nuttynil
Sorry mate, didnt notice your post!!!
Ive only had the car for a year and its spent most of its time doing nothing as it starting knocking, loudly!!

Once stripped it appeared that it was rebuilt without any valve stem seals At All!! and it had somehow flipped a shim out of the follower.

A mate of mine is soting it out (slowly) but the only person ive really had any dealings with is Mike at Lotusbits, very helpful and knowledgable bloke, known worldwide and a bit of a Lotus guru it seems from the lotus forums.

Other than that ive been trying to sort it without giving someone £££££s to rebuild the head.

How do you find the Sunbeam for reliability, power etc?