Cheers Pete, did get virus and with other complications now have 'long covid' but still here so that's summat.
Anyway weird thing with car it was always giving heat no problem just not coming to centre on guage unlike my V70 which was always cold till I did the stat. It went to garage last week and they did a pressure test on cooling system and found a crack on the top of the tank so tank had to be replaced. They said they could find no other issues and had car running for ages on and off road. Since tank was replaced car has got up to centre on guage a few times and also gets up to temp (was only getting to 68 degrees before) and mpg is starting to get better each time I run it.
My conclusion is stat is slowly failing ie slow to work or coolant sensor is faulty.
Given age of car and all I'm inclined to leave it for now and see how it goes.
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