Finally gave up today and took it my local model shop i paid them a few quid and they got it running.
Turns out there was a problem, the throttle linkage to the servo was totally out and wasnt opening the throttle, they said it would have never started.
They reset this along with the brakes as these were incorrect also.
Also the engine was extreemly tight. they poored some kind of lube down the glow hole and pulled the starter and lossened it all up.
Took it home and it started on second pull hooray, now having fun with my son, running it in before giving it some welly, surprised how fast it is even on low throttle.
From my expeirience if you have this model and it wont start check all he above.
Thanks to all that replied.