Renault Clio II 1.4 Priviledge 2001 - hard starting when cold - burge

Our clio has been hard to start when cold, on & off over the last couple of month's when it has done this and we have got it started, once its hot it starts ok, sometimes though the next morning it will start fron cold. It now seems to be doing this more often, I seem to think I have read somewhere that it may well be something to do with the temperature sender. can anyone confirm this?

Thanks Burge

Renault Clio II 1.4 Priviledge 2001 - hard starting when cold - unthrottled

A short would cause the ECU to think the engine was warm when it isn't. What is it like when it is started? Any roughness?