Considering the amount of times my card has been in and out without any change I don't think my fix will be as easy
I did pop into the local Renault dealer today but there was no-one there who could take a quick look. I am going back tomorrow.
I will be quite pleased if it is the card however as getting my card re-programmed or a new card (which I intended to do anyway as I only got one with the car) seems like a lot less hassle to me.
Glad yours seems to have sorted itself though!