Replaced my stat on Sunday, its fiddly but manageable. Part & seal were £9 at Eurocarparts + antifreeze
Only reached 90 at long idle before but was v low on normal driving: heater was luke at best. New stat fixed all that, now bang on 90 after 4 miles from cold today. Runs better & uses less fuel I reckon. Changed coolant temp switch as a precaution, 5 minute job and £22.
Steve.