Instead of waiting to wednesday for renault to read the codes... would it not be best to try get it to a local garage with good diagnositic software or a renault specilist (non dealer)... that way your know if you are/not doing damage continuing driving it, i know you only do small miles... but ive had to do the diagnostics a number of times on previous cars at normal garages and they charged me around the 35 quid mark for peice of mind!