That’s very kind, sir! I will be in touch very soon 😀 I suspect my activities will all be in vain (ie the bike will still boil over) but at least I will have eliminated everything bar the size of radiator. The bike is currently running lovely with needle is raised to its uppermost position so I am now longer concerned that its too lean. The plugs were a much darker colour and its even ticking over now. MInd you, the downside to that is that the four-stroking is now annoying at lower speeds.