Hi guys just an up date.
Went through everything.
Changed the CR9 plugs for CR10's.
Nothing, drained all the gas. It looked bad. Yellow and oily.
Fresh gas and it started, Synchronised the carbs and did a 25mile blast with no issues.
So was the gas, which seemed impossible to me as bike had only been parked for a week, when it first refused to start. Or was it the plugs.
Which ever it was, thanks to everyone who offered help..... My parting wisdom is "check and double check the bloody obvious!" Lol.