I haven't checked the valves - because the problem's persisted beyond the replacement of the head. I think they *need* checking, but I can't be arsed now. It's not such a trivial job on the horizontally opposed engine - especially when I can't get her up on ramps. But there's definately fuel getting to the cylinder - 'cos I could smell it... Spark - could be lousy, but there's definately one at the plug... and I've tried a new plug :(

Cheers for the suggestions tho'