Thank you for such positive comments, now nearly 11 months after completion. For the benefit of some readers I hope the following helps explain those price increases. Originally we discussed DIY prices. Then this switched to Fitted By Us (supply & fit). When customers are far afield we try estimating from photos. Naturally we often find new information when making our first visit, and this applied here, and not minor unfortunately. Happily we had the expertise to deal with those challenges! I did on this occasion also make a mistake: a matter of several hundred pounds, which I spotted and this required me to re-quote, before settling our agreement. As always with our customers, in the end we agreed a fixed price quotation valid for 10 days.