Also this - ours are double but if they're all closed you can barely hear anything outside, massive difference from before for us, even more noticeable this new year lolTripple glazing only if exposed location or a noisy road nearby - otherwise double should be surface make sure they Insulation is spot on on all windows with insulation foam- which sounds like the last firm who fitted them did not do!
Still in shock about the prices in the UK though. Ridiculous for something that doesn't require a lot of specialisation or anything...