The headset should be fine, and should come with a star nut included, but you might want to double check before you order.
"can anyone recommend a cheaper chainset?"
The Pake crankset goes for about $60 here in the states, which is MUCH cheaper than the 137 POUND Stronglight, but it may be made of a different alloy.
Both take a 107mm spindle (68mm shell) bottom bracket (the Shimano UN54 is a good value).
I run the Pake Crank/Shimano UN54bb on my bike and it seems like a good combo for a decent price, but if you're doing serious racing, you may want to talk to the guys at the track and see what they recommend.