So I managed to drive over a brick and completely wreck one of my alloys. I now need one to replace the damaged wheel and another to replace the spare wheel (as the spare is 17" standard wheel and doesn't look too clever).

I think these wheels are discontinued - my car is a 51 plate IS200 Sport - can anyone help me locate these wheels please?.

you might be able to find them on EBAY, have your tried the dealers

Have you thought about getting them refurbished ....presuming it's not buckled