I found an old needle and gently rubbed it around in the very tip of the nozzle and forced an amazing amount of old paint out of the actual nozzle itself, and the three tiny air holes under the nozzle cap... fink i found the prob... ;-)
Tried the screenwash trick too - good one!
Cheers for all the tips, now to get my B44.1 shell to match the Kifo shell that came with the B4.1 Centro I just picked up on here...
(Blimey, actually doing one of my own for a change!!!!!)
cheers
Ju