if they really wanted to theycould get you a spare wheel free of charge seems to me they are not being very helpful there just seeing £££££££££££ signs i would tell them the fact that it has left the factory and is now in there dealership is of no concern to you have not taken delivery of the car yet so you are not taking it back and requesting a spare wheel you are asking for one before taking delivery of your car so in my opinion should it still not be a free option ?