Taka- can you send me an e-mail about the forks? I'll get them to you Friday morning if that's OK with you?
Also, check this out. It's not a "race" as such, but I fit this and another one in Meltham in every year because they have all the race feel if you want it, and there's a good bunch of people that do it. They're also cheap!
http://www.bikechallenge.co.uk/
Are You Tough Enough?
Check out the brown backs events, and if you can. Also, if you have a parent to drive you, the last round of the Midlands XC Series is at Sherwood pines, 1 1/4 hours from Halifax. It's a flat place but it'll be a good opportunity to get a feel for proper racing.
http://www.xcracer.com/content.php?pid=249
Going into this time of year there isn't much, but there is a new northern XC race series that British Cycling are organising with a youth section for U17s, and there's challenges all over yorkshire all the time.