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dare I ask..?! :D
@rhowe - yep, edwardian terrace here
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Ok what that mess said is; I shouldn't comment, and cannot argue because I drank all the wine, very much sorry. But I had an idea (and am not a heating engineer) assuming all standard checks are there (bleed system not full of sludge ect) if you want a rad to have a higher output, install one with a higher output, potentially there maybe no need to change the tails, it would take research and measurements but second hand or salvage (even scrap) yards could have a better outcome to not much more effort . hope it work whatever direction you go
Don't ever finkin do that- not a joke
= but equally I'm not going to argue
edit - ok bit harsh, but I'll remain that way, if you want your radiator to radiate more from glueing plastic and foil to the wall isn't a gratifying solution, would you cover the whole wall in it?