well, placed the order with Speed and Sport last night (on the proviso that it was actually white) and got an email back from them this morning....
It was mislabelled - the one they had was blue, not white.. :'(
So I am still looking for a white IT250/465 H headlight!
Thanks to everyone for all there help till now.
Still looking!!!!!!!!!!!!!!!!!
(btw, nice quick reply from Speed & Sport too - They're not the cheapest, but I've NEVER had a problem with their service)