clio rs 197 thermostat

Hey, my clio is leaking coolant and I had a m8 pressure test and it seems to be leaking from the thermostat housing area, I'm not a massive mechanicaly minded person but do the odd bit of diy haha does anyone know where I can get a thermostat housing from or know the part number? Iv noticed on most clios the housing is made of plastic but from what I can see the clio 197 is a metal housing? And is it an easy job do to yourself? Any information would be awesome.
 
My 197 had this same fault last year at service time - housing area was leaking and was dumping coolant. All work was done by the dealer so I don't know how easy or hard it was, however they had it done very quickly, so I imagine it wasn't too taxing for them. Apologies if that's a bit vague....