Gaz, there is a current TM thread on a similar issue with another 2008 4/4 here. An 85°C thermostat was used as a replacement. Note also the common issues with 4/4 models fitted with larger aftermarket aluminium radiators.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone