Sorry for the delay in getting back to you, but I have been waiting for a well reconmended auto electrician to spend some time on my car. (he was busy with work and holdiays)
He has checked the car and seems to think that the imobiliser unit, which is located above the glove box has gone.
So I am now at the point where the car is worth about £1000-£1200 in full working order and do I spend more money on possibly getting it repaired, or sell as it as spares or repairs? And a visit to Renualt is not worth the value of the car.
However, I have seen on ebay a ecu set for £70-£120 (link below), this includes the fuse box, key card, key reader, steering lock, ecu and imobiliser unit. Is it advisible to change these? Is there anything else that would need changing or coding?