As someone who recently made the opposite switch, I can empathise.I'd try the usual big agencies but also try your own networks from industry, not all company postings make it to the outside world - even when there's no internal candidate in mind. With respect to the question on skillset and placement, I'd assume that after 6 years in big4 consultancies you're fairly adaptable, but would suggest any of the major banks as they all have inhouse Tech/Ops functions and 'internal consultant' roles are commonplace in these, I was previously titled "Change Mgr" in Barclays Group Ops but effectively held a consulting type role and had no domain specific technical skills.