Thanks for the advice, I had considered a small usb powered fan for underneath the radiator, particularly this type as small form and hopefully not too noisy.
Edited following rethink.
Yes, definitely insulated.
Unfortunately, we had issues with the roof leaking due to the low pitch being too low. We had it converted to a warm roof which has a large amount of insulation on it and there's the remainder of the existing insulation inside below the ceiling.
It's a frosty morning here and reviewing the numerous thermometers I have, currently there's s not much difference between the extension and the bedrooms but the lounge is warmer.
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