Cheers fella's, managed it in the end without the use of the heat gun
. Tell you what though, I'm glad I decided to completely strip and clean the carb this time, when I removed the jet block and had a look down the carb there was what looked like 10 years of compacted road dust where the slide sits, so the slide prob never seated right all the time I've had it, all the airways seemed not to bad but cleaned everything out and blew compressed air though it all.
I decided to head down to see brian at lightning spares to treat the carb to a new needle, needle jet, inlet oring seal, while I was there Brian had a quick look at the carb and said the slides a bit worn, so a re-sleeves prob on the cards soon.
Anyway, put the carb back on, pulled the petrol tap, no leaks from the carb, good(confidence starting to rise) went to start it and took ages to start and ran like crap. Confidence then hit the floor and Panic started to set in a bit with the words should have left well alone ringing in my ears. Anyway after her in doors came out to investigate what the banging noise was (massive backfire). I had time to calm down and think about it. So off came the jet holder to re-check, new seal and back on. Checked the leads and the left plug cap was only sat on the plug (me, forgot to push back on properly) I then felt the exhausted and the right one was hot and the left one warm. Took the plug out and soaking wet. So left for half an hour, put new plug in and started, and definitely ticking over more evenly and revving felt a bit more crisp than it did.
All good. Nice one guys. All the best, Chicago.