Can endorse this further. HG did our front door years ago and it's still fine. After sales service excellent - dodgy letterbox (not their fault) replace 3 times until they found a unit that didn't corrode after three months - no problems (or draughts) fo years.
Did any of you haggle regarding the initial price? I know this is common practice with the national firms lke Crystal and Everest but is the price Hertford Glass give you their best price or is there room for manoeuvre?