I was hoping someone from the 'wheel expert' sub-section of Geeks would have popped up by now.
In their absence I'll say, I'd imagine your LBS will be able to true the wheel back to it's former glory, at a fraction of the cost.
Although if you have new wheel money, to hand, it is the very best upgrade you can perform on your bike.
Thanks! I might see if I can pop down the local bike shop, then. A wheel upgrade was something I was planning as the wheels on my bike are fairly cheap stock ones, but I was hoping to put the upgrade off until next year.