I bought them.
A couple of people have mentioned they might be interested in buying one as a spare, i'll certainly keep one but the other three i'm happy to share with my fellow Aero owners.
Paid £2k flat and collected them yesterday so they're "in hand". All four are holding air so far :-)
So if any other Aero S1 owners want a spare wheel (just in case) just drop me a line. Not looking to make a profit, just happy to help others keep these wonderful cars on the road.