Ben H - What evidence do you have that cars that are thrashed from day one are faster, when the power stats of Clios varies so much anyway? I looked after mine (well mostly) for the first 625 miles and my car has managed to see off CTR, Skoda RS, Audi S3, Many BMWs, Cooper S, MG ZR 160, to name a few.
You should stay below 3500rpm for the first 625miles, oil change between 1000 and 1500 miles is also good.
Congrats, hope you enjoy your car as much as I enjoy mine.