RBS. Aviva. NABG. And that is just the larger ones I have experience of. Those are pretty big hands to wave. If we say "sorry, our products might not work as well in IE8" they'll say "sorry, we can't use your products any more".
And it isn't just that they demand IE8 support in case their customers need it, their desktop builds used for all their internal uses have nothing but IE8. "Maybe they'll upgrade soon" we hope, "or perhaps given their users one of ff/chrome/other as an alternative along side IE8", but given they only upgraded to IE8 from IE6 over the last two years (the last of our clients to move from IE6 completed that transition about three months ago) I doubt I'll be seeing them use anything better internally for a good few years.