I had a 'cloudy to clear' (or some such franchise) quote for fixing a rooflight, so that is :- separate/descale/clean/seal (with silica tape). That it was much cheaper getting a local glass man to fit a new sealed unit, as opposed to the franchisee taking the p*ss, didn't really surprise me much as it always is the case ☹️ it seems for franchises, BUT when a new factory was nearly as cheap as the locally made unit did slightly surprise me, and indeed that is what is fitted, I guess it was less hassle in the end for the installer?