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AFAIK. The base spec cars go directly to the dealerships where the conversion kits are fitted to the them. So the dealers will probably have the wheels.
The base cars go to Intenrational Motors in Quedgeley where they get modded. The dealers only see complete WR1's (and then only after huge frustrating delays.....). So the standard wheels are with IM.
The last time IM modded the cars themselves was I think the UK300 and the original wheels from that episode ended up in the dealers after a couple of months for pretty fair prices (like almost as cheap to buy four brand new wheels with tyres than get new tyres). So watch the dealers.