I thought I'd give it a go today, tried starting but same as usual, loads of tries before it would fire up.
I took the tank off and just enough pipe length to put it where the seat was.
Airbox off ans check for any broken/split pipes etc.
Couldn't see anything that looked wrong so put everything back.
Would you believe the 4 times I've started it since, it fires up 1st turn of the starter... Amazing.
I'm guessing something wasn't quite seated right previously and me removing/replacing it has reseated it.
Oh well however I did it it's now all good.
Thanks all for your input
