My Father-in-law is in sheltered flat and they are in the middle of changing over from E7 to gas fired heating [big main boiler with a heat meter in each flat] they are insisting that where there is a window in the room the rad is under it. When he asked for them to be where the storage heater was there was an explanation that under the window is more efficient/effective as it heats the coolest air. Sadly they mounted the temp sensor on the partition wall the other side of the heat exchanger so it has to be set to something like 28'C, we've asked for it to be moved but have to wait for the end of lockdown.... however I have seen radiators right under the windows, so hottest air goes to the worst insulated part of the room first, so massive amounts of heat lost, but it did free walls for furniture, so not all bad.
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