Business to social science is a bit of a leap. You'd probably have to take a taught Masters degree first, in the topic you're interested in, (1) to overcome your 2.2 which would be somewhat difficult to be admitted to a PhD with; and (2) to start to build up the specialist knowledge in your new field. Normally you'd need to fund that Masters yourself, even if you were (possibly unlikely, with that 2.2) to win funding for the PhD afterwards.