Reply to "Some good...some bad! It passed the MoT test ... But it over heated on the way home."

Sometimes the first thing to determine is not the most obvious.

Something wacky appears to be going on here.

The forum wisdom has determined your Pantera had the incorrect thermostat installed. You now say you have the correct one from the "number one guy". ARE YOU SURE?

Even with our photos of the correct style thermostat, you seemed to not grasp the difference.

Can you please post a photo of the one you sourced in UK?

For now (until we see a photo), let's assume it IS the correct style, let's move on.

And actually, even it is is the wrong one, the pipes and radiator should be getting warm.

Which leads me to this train of thought.

The problem is believed to be poor circulation of coolant.

What circulates coolant? The water pump.

SOOOO.....

Have you confirmed there is a fan belt turning the water pump? A bad belt means no circulation.

If confirmed, you next need to confirm the water pump is freely rotating.

I've had just one frozen water pump experience, but it can happen.

Just saying........

Larry