We have what was an open porch on a 70s bungalow which had been enclosed on the 2 open sides with UPVC double glazing and panels at some point. We want to remove the UPVC which looks **** and build a more “permanent” wall. Problem is the porch is only circa 900mm wide so a block cavity wall would be too thick. I was thinking of a hefty stud wall but am unsure of insulating this best or whether there is some funky left field option? The new porch resulting will be heated so insulation is an important consideration. Has anybody any advice on how they would go about this?