More than half (53%) of partners at 10 of the U.K.’s top law firms come from private school backgrounds, according to a report by not-for-profit consultancy firm The Bridge Group.

The findings are the result of a collaboration between The Bridge Group and top firms including the likes of Allen & Overy, Linklaters and Slaughter and May, and is aimed at understanding how socio-economic background affects a person’s progression to partner.