Why does anyone allow their labor to be resold at such a high profit to someone else? If someone will pay £400/day for your services then you ought to receive the bulk of that yourself.
It's more true than it seems. The client I first worked at was UBS. While I was in Switzerland, I actually applied for a role at UBS - they rejected me outright. Accenture hired me, and then sold me to UBS for probably 5x what UBS would have paid if they'd hired me.
Whilst I felt a bit used in this, I do recognise that most of that 5x premium was due to Accenture's brand, nothing to do with my skills or experience.
It's about time governments stopped using big name consultancies primarily because of their name rather than any measurable benefit, and paying (apparently) a 400% premium for the privilege. That money comes from taxpayers and doesn't even go to the skilled people actually doing the useful work.
This probably ranks alongside laughing at anyone who defends excessive compensation and bonuses for for senior management, investment banking staff, and the like, on the basis that they need to pay competitive salaries, all while those staff are actually making decisions that result in huge losses to their employers. It is never necessary to pay the market rate for incompetence.