Right, got a response from the finance company just saying they will investigate this matter and let me know.
The garage have had the car back, apparently the noise was a pulley which they have replaced and also replaced the cam belt (apparently to do with each other).
They contacted the previous owner (a garage) who sent them a certificate with change of clocks...
They have however said they will get a renault specialist to put original 172 clocks on the car.
Advice? Would you suggest take the car back now fixed or due to all the dodgy problems and messing about do I continue with my rejecting of the car.
By the way, spoke to Trading Standards again who said it is Supply of Goods (implied terms) 1973. This means if I want the refund, I CAN!