Which Sherlock episode was your favourite that you and Steven created? 
A Scandal in Belgravia by a mile. It&rsquo;s such a beautiful piece of work. It honours the original story but extrapolates amazing things from it. It&rsquo;s funny, weird, scary, thrilling and, ultimately, very moving.
From a new interview conducted by Hampstead Theatre via Twitter, to mark the opening tonight of 55 Days starring Mark Gatiss. Read the full interview here, and check here for ticket information on the play, running until November 24&amp;#160;2012.