You could try searching Hobsons for a fairly comprehensive list of graduate employers in consulting (and in other sectors too):
<a href=http://www.get.hobsons.co.uk/careersSearch target=_blank>http://www.get.hobsons.co.uk/careersSearch</a>
However I should caution that the majority of smaller consultancies do not hire straight from university. Having intakes of new university graduates tends to be something that the larger consulting firms do to get the necessary scale and billing profile needed to make a large firm work. By contrast, smaller consultancies tend to use the fact that their teams will be comprised of very experienced consultants as a selling point to clients - which obviously isn't compatible with hiring graduates with no experience.
Hope this helps anyway and good luck