syko.
Congrats on the new ride. :cool:
You may be flooding the bike. Try starting it without touching the throttle and without the choke. If you accidently twist the throttle while kicking it, it will flood. Hold the right side handlebar by the front brake resivour instead of the throttle until you get used to it. If it won't start, choke it and try again.
If it still won't start give the throttle a couple twists like procircuitdude said. My 450 starts cold with just a couple twists of the throttle and no choke but, I may be in warmer conditions than you are. The one's we get here in California are jetted very lean and it helps to install a larger pilot jet. Not sure about the UK models.
If you think it is flooded, turn the throttle wide open and hold it open while you kick it over about 8-10 times while holding the kill button. This will clean it out. Then, with no throttle, try kicking it again.
Usually if the valves are tight, it will be harder to start when hot. If it starts ok when hot, it's most likely not the valves. It's a good idea to check them anyway and often.
Good luck.
Ol'89r