Welcome to the club
Yeovil wheel and tyre do refurbs (Somerset)about hours drive from Poole
also you could try south coast wheel and tyres (I think thats the name they go under) in Southampton
I know theres a few alloy wheel shops in Poole/Bournmouth they may be able to help
you may have to do a search on the net or Yellow pages (yell.com???)
enjoy your ride