Building regs are really quite insane in the UK. I live in a listed area, and I'm supposed to get heritage officer consent if I consider changing the windows from single to double glazing.
This makes sense if someone puts UPVC into an old cottage, but it still applies even if the window is visually similar to the original - and some of the originals date from the 1970s and not the 1770s.
- Jake If you only spend 20 minutes of the rest of your life on economics, go spend them here.