You do remember that they laid off a lot of staff there just as it turned to Brawn GP? Before that they had one of the largest elvels of staff, and to my knowledge (given to me by someone who worked for the team) had too many people working there. They are now at a level that is correct and doesn't contain bloat.
half as many as some teams though unless they recruited a lot of people, afaik they are still the only team under what could be the imposed staff limit.
i dont see the staff limit ever beeing enforced though at the time it seems like a smart move now with the 40m budget gone and the staff limit looking like it wont ever happen it just seems to have been an epic fail.
as i said before f-duct no worky , blown diffuser no worky, dont think they have had any upgrades so far this year that did a damn thing!