Your academics will probably be fine for most firms, but what work experience (including research positions) do you have?You'll need to demonstrate that you've done something substantial besides the PhD to account for the up to six years headstart others applying for the graduate positions will have on you.Also, as you say, your studies haven't been business-related so you'll need to work hard to demonstrate your acumen, commitment to a consulting career, lifestyle, and all the usual generic skill requirements that graduate recruiters look for.PhD's in quantitative subjects can be advantageous for some financial consultancies, but I don't know of any management consultancies that favour PhD's in their own right (i.e. without the corresponding experience in an area that they can sell directly to clients). Perhaps look at some of the smaller and newer consultancies as they are likely to have more flexible career models?There are quite a few consultancies focussed on the public sector - some exclusively and some which have developed strong public sector practices to take advantage of the recent relative strength of that market. In fact many consultancies have been involved in the public sector recently since there have so many big contracts/sub-contracts going.All the usual names (PA, CapGemini, IBM, etc.) have opportunities in public sector, but I'm sure you'll know of them already. Other firms you may want to look at are RSe Consulting, Tribal, Serco, Capita Consulting, Hedra and Oakleigh. Try searching the jobs section on this site for ideas too.Unfortunately, public sector consulting doesn't generally offer as much as other areas. The gap is closing a little though as there is currently high demand for public sector consultants with experience. Have a look at the top-consultant salary surveys for more detail though.