Contact the MCA - Management Consultancies Association - they have a pamphlet on careers in management consultanting. This includes a definition of the profession, examples of their roles, etc.
The Management Consultancies Association
London SW1A 2BX
Tel: 020 7321 3990
They're a friendly bunch - give them a call! If you need more help email me - I did a dissertation on them and may have a rather handy chapter for you.