This is why I can't be bothered half the time, so last year I started buying some secondary windows A to reduce noise from Neighbours B see if it helps keep warm in
Only buying second hand units so it's cheap project and so far I've only spent about £400 and only need 2 more for last 2 upstairs windows. having to cut them down to refit, I've mananged to trim the glass down for a few so far but I got some huge ones as my bedroom windows are massive, probably close to 3/4 of the wall size, had to change from 2 panel to 3 panel to fit windows I have so you don't notice them when fitted, glass was toughened so nothing I can do but dispose of, need to get some 4mm polycarbonate ones cut for the 6 panels but the rubber U channel seal to fit over edge and fit in frame is 10mm height, 7mm wide and take 4mm glass which seems to be difficult to find, plenty places selling but not correct sizes and if they have prices are a joke on ebay and many small businesses, they want like £3-6 a meter so you spend like £75-£150 for rubber then they polycarbonate as well end up costing a fortune so the job never gets finished. The other windows I did were okay as I used the original rubber but these are Everest ones and rubber is just falling to bits so needs replacing
Can get rubber edging for car cheap but not what I need, gonna be expensive if you buy something that don't fit and many don't say thickness of the rubber, then measuring up for replacement windows, if I get that wrong it's either expensive mistake if too small or probably hours of trimming it down if too big, measured up the inside of frame but then need to add more on for recess into frame, some measure 8cm, some 9 and even 10cm but with new rubber I'm thinking 8cm max then hopefully won't be too big, getting a price from local guy for them, just need this rubber sorted