Thanks, well I went to Eurocarparts and the bloke said I might need the whole plastic housing on the thermostat, not just the unit, do you know if this is true, also is there a how to fit both of these.
To further help point the likely problem I noticed the car runs at 65 degrees on the open road, its also a non-climate control 1.6 which recently had a waterpump and radiator. But hot air is coming in, so dont think its a airlock or anything like that.
Any advice, maybe good palce to purchase parts really appreciated. Will keep searching too.