We have put a tool online for parliamentarians such as yourself to look at the personnel costs in the public service by department. You can see the evolution over the last several years of total personnel costs and FTEs.
We don't, however, have such a tool for contractors and consultants, which are sometimes substituted for one another. To be honest, I haven't looked at the issue of consultancy fees in the last public accounts, but I'm sure that would lead to interesting nuggets.