It is my experience that Renault UK Customer Services are very understanding in cases like this and very often provide a like-for-like courtesy vehicle if there is going to be a delay in a warranty fix. However, it's a bit late for that now.
You don't say whether you purchased the vehicle new or used, but any issue you have with the vehicle can only be taken up with whoever sold it to you, as it is with them that your contract exists. Renault UK provide a back-up warranty service for their products but you cannot sue them (unless you bought it from them) and they are, by the sound of it, fulfilling the terms of the warranty.
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