The move from IE6 to IE8 has (pretty much universally in the investment banking industry in the UK) only been over the last year or so.
They are still pretty much all on XP, but new laptops are generally Windows 7 (with IE8) and I suspect Win7 will be rolling out to older standard builds (both desktop and laptop, machines old enough to not be Win7 compatible having been replaced already) as the first thing the relevant TS departments do after the Christmas/NewYear non-emergency-work freezes.
They are still pretty much all on XP, but new laptops are generally Windows 7 (with IE8) and I suspect Win7 will be rolling out to older standard builds (both desktop and laptop, machines old enough to not be Win7 compatible having been replaced already) as the first thing the relevant TS departments do after the Christmas/NewYear non-emergency-work freezes.