Farrer & Co

I've been invited for a TC interview at Farrer & Co. Apparently, it will last about 1.5 hours, and involve a written assessment, so I'm just wondering if anyone knew any more of the detail? This is all a bit new to me - I literally decided about 2 months ago to go down the solicitor route instead of the Bar, so have no experience of TC or VP interviews, though I somehow have 2 TC interviews lined up already! Any help would be appreciated.