Don’t know if you’re into spannering, but have you seen the ‘07’ plate V70r on eBay? Sounds like it may have head gasket problems, or possibly just a stuck thermostat. It’s on south coast, would definitely have been tempted if it was nearer to me so I could have a look to see if coolant over pressuring or not.
Shed load of advisories on last MOT as well.
https://rover.ebay.com/rover/0/0/0?m...2F372654996578