I've actually worked out there is not much money it... I'm going in-house corporate so money (both perm and contract) is better than all those cool and edgy little agencies I used to bust my nuts for in Shoreditch. It's far from cool but I'll dry my eyes with my £50's.
TBH the money is just as good, I will run a division of the consultancy I work for. I am just spreading the risk as my take home will be part salary, part day rate...plus benefits (Holiday, medical, pension etc) Equity in the Co yadda yadda yadda
I prefer to have more money and more flexibility in these uncertain times.