I am having trouble understanding your point of view. Please indicate to me where abouts in your new car contract does it say that if there is a warranty issue that the dealer or Fiat has to supply you with an equivalent car let alone a loan car.
Contract? You mean we were supposed to receive a contract?
From http://www.consumerrightsexpert.co.uk/BuyingANewCarYourRights.html...
New cars come under the Sale of Goods Act. That means they must be "as described," "of satisfactory quality," and "fit for the purpose" - in this case, if you specify a specific need to the dealer, the car he sells you should be able to do that. If your car has a problem in the first six months, get the dealer to repair it (free of charge, of course) or replace it. Think twice before allowing a repair, since it could affect the resale value.
I don't think there's anything in there that says, "things break, learn to deal with it".
I'm pretty sure that a light saying "return me to a garage" is not "fit for purpose". According to that, we have a right to a replacement. As they can't produce an identical replacement just like that (understandably), the next best thing is to repair ours whilst providing the nearest replacement they have. Which they did after I called them and said, "surely you should be providing us with another 500?". That's all I said, and they didn't even put up a fight. Just a shame they didn't do it off their own initiative.
I really am suprised how many people think it is acceptable that they don't get a near-identical courtesy car if their new car goes wrong in the first day. Whatever happened to that british fighting spirit ("we shall fight them on the beaches", etc)?