Just had a bit of slow journey home and noticed the temp needle had moved up to just under 100 degrees. Scanned when i got home and no fault with the coolant sensor and VCDS showing 99 up to 101 degrees when i went for a short drive. Fan kicking in at about 100 degrees so that works at least.

Sound like the thermostat needs doing? It was last changed 5 years ago...

I went for a metal impeller waterpump when changed the timing belt last year so thinking/ hoping its not that.

400 miles short of 100,000 so i was waiting for something!

Any thoughts appreciated.