[rasur]

Well, I haven't worked there since about 2006, so numbers may have changed, but it was at least 10000 servers of various types (redhat, solaris, windows were the usual suspects I had to build out) of which I was aware (between maidenhead, the various colo's i had some responsibility for, tv center, white-city).

software? i know there was a lot of perl, ruby was gaining some traction, a few different CMS's.. etc, i've (thankfully) forgotten most of the details, but diverse ecosystem is an appropriate phrase here.

undoubtedly things have changed between then and now, but i'd guess it's something similar hardware-wise.

My penultimate day of work was racking up ~300 servers for the i-player farm (i was a system engineer) at red-bus in docklands. My back has only really just started to recover. :/