Thanks for the replies everyone
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Your thermostat should control the final coolant temp by regulating the flow rate to the radiator. If your grill block has affected the final coolant temp, that means the thermostat is full open and has lost the ability to prevent overheating.
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I now believe that the thermostat is duff. The grill block does affect final temp and even with full block it only sometimes gets to 90 but drops straight away once moving and even if I put the heater on.
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I have thought about this, but I'm not sure if PSA has a hotter t-stat that is interchangeable. You might be able to DIY a swap (like this: Modified Thermostat for higher MPG's...) if you can find a hotter t-stat that will fit. My engine's t-stat is inside of a plastic housing with the temp gauge and I'm not sure if it can be opened
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My thermostat is also in a plastic housing. From reading around I think it's only the one type available.
With the higher temp the grill block has given me though and my new driving style my last tank was 71 mpg. Stock combined is supposed to be 65.7 so I'm smiling. (Hope we are still on winter diesel). Today I looked into the floor pan but conditions and time don't allow it yet. I have now removed the mudflaps and fitted a front dam and rear tyre spats so I will be watching the gauge with intensity next week. I can't get a scan gauge as the car isn't obd which is a little annoying.
I'll post in the linked thread about the chip.