As another person with rather more knowledge of architectural design processes pointed out in great detail on this page, the group that designs the facade is not the same as the group that models its behaviour under certain conditions, which is not the same as the group that makes the final decision on the tinting of glass panels, which is not the group that erects it to surprisingly imprecise tolerances.

We're not talking about something obvious like Linux vs Windows. We're talking about something which is superficially obvious like integers can exceed X digits ...where the actual integers are the product of a decidely non-obvious set of calculations intended to generate low values but affected by code several specialist teams have commit privileges to.

We're talking about a very slight degree of concavity on part of a large facade focuses the sun's rays for two hours a day, two weeks a year provided the surface material is sufficiently reflective and London has less than its median 68% cloud cover for September. And we're also talking about a building that isn't finished yet: here's an architect's rendering of the offending facade that appears to have ridges the current sheer shiny wall doesn't http://www.google.co.uk/imgres?um=1&safe=off&client=firefox-...

It's not like either glass facades with some degree of concavity are unusual or being singed by them is common. Unlike database errors those stupid developers keep coming up with.

n.b I don't even like the building; it's fugly from where I'm sitting. I'm going sunbathing there tomorrow though.