Don't get hung up about location. The base is nominal, though you may be required to appear in Fleet during the early days. With the move into "big" BT, consultants have a lot of bases to work from. As with all consultancies you can't guarantee where the client work will be, but BT currently has a lot of consultants employed on the NHS work in London, if that's where you want to be. By the way, they also have a base in Edinburgh.