I had a top couple of hours on Sunday morning and thanks to all for the information. Being a noob is never fun, but you all made me feel welcome.
To that end, I have a bid on sleezeBay for a nearly new 2WD B4. £80 all in at the moment, but I am prepared to go to £110. It looks very clean and undamaged. Good photos, so here's hoping I don't get ripped off. If this fails, I may just buy new when I get paid on the 24th. Gagging to get racing now! Me and my son will be fighting for racing time!
So, cheers to you all and see you soon!