Do I give up on my bike?

Just had a bit of a crash. I was buzzing through a village in North Herts enjoying the sun and the countryside, came over the brow of a hill at 30ish and saw a horse 200m in front, so touched the front break so I could pass it slowly. Next thing I knew I was skidding backwards down the middle of the road. My fork had completely failed, one side had opened by about 45degrees leading to a bit of improvised unicycling. I'm ok if a bit grazed, thankfully nothing was following me/came over the blind summit whilst I was lying in the road, and quite a few people were really friendly and helped me out.
The question is though, do I repair the bike (new front wheel and fork) or do I just call it a day and upgrade? The bike only cost £45 (although its already had £40 of repairs and a weld repair on the back fork) so to spend a reasonable amount of money might be a bit silly, especially as I was looking to upgrade soon anyway. Is there a chance I might be able to pick up the parts cheap at a LBS in Cambridge? Bit gutted, the bike has really got me into cycling, although I've only clocked about 1500miles on it, so its sad to see it in such a state.
The question is though, do I repair the bike (new front wheel and fork) or do I just call it a day and upgrade? The bike only cost £45 (although its already had £40 of repairs and a weld repair on the back fork) so to spend a reasonable amount of money might be a bit silly, especially as I was looking to upgrade soon anyway. Is there a chance I might be able to pick up the parts cheap at a LBS in Cambridge? Bit gutted, the bike has really got me into cycling, although I've only clocked about 1500miles on it, so its sad to see it in such a state.
Racing for Fluid Fin Race Team in 2012 - www.fluidfin.co.uk
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2010 Giant Talon 1
Otoh, you might want to see what secondhand bikes are available instead..
Given the history of the bike frame falling apart, I'd think about looking for a really cheap secondhand bike if all you want is something to get down to the shops on - try the local papers and you'll probably find something for less than you'd need to spend fixing what you've got.
No. You need one for the right wheel size (700c?) and of the right steerer radius. Oh, and having a long enough steerer, although this usually isn't a problem unless you're buying a used fork that's been cut down. You might want a copy of Zinns Road Bike Maintenance and/or to look at Park Tools site, where they a how-to for virtually everything. Look at Sheldon Brown's site too, if there's something relevant there it will be good.
I have picked up 2 almost new, mint condition, quality framed raleigh bikes off e-bay that are light,fast and most of all safe for the £50 + mark each.
Jim