Thankfully its only the thermostat playing up.

V.Slow to get to "normal" position (straight up in the middle of gauge)

Then temp keeps dropping when cruising

Only get a slight temp fluctuation with the heater on warm up but once temp gauge "holds" normal temp the heater is proper toasty

Not overly worried as it never "overheats" even when booted heavy

All air bled from system so not trapped air etc and water pump is pumping water into reservoir tank when cap removed (when cold)

Ah well - New Stat Please

Suppose I better sort it this week