Thanks very much for that. That's a really helpful explanation. No, I haven't decorated yet - want to get all the potentially messy (or damaging!) work done first.
I'll have a go at inserting a packer. I did have doubts about a compression seal as the gap isn't uniform all the way down, but...
Hi,
I'm in the middle of completely redecorating and fixing a bedroom in a house built in 1950. The room has some very old double glazing (minimum 15 years which is when we bought it, probably a fair bit older). The guy who owned the house before us was a general builder/painter/decorator and it...