Ok, bit of an update. Just spoken to mt local Mini dealer, Sycamore Mini Peterborough. They do a space saver wheel and tyre for it at £110.00 + VAT, seems bloody expensive to me.
Interestingly though, they told me that it will not fit into the circular well thats under the boards in the floor at the back of my Clubman. This poses the question, why the hell is this recess there in the first place? He could not answer.
So, has anyone with a Clubman put a wheel of any description into this well under the rear floor?