Steven Moffat, co-writer of the BBC's Sherlock, has given some hints of what audiences can expect in the programme's second series.

Speaking on BBC Breakfast, he praised the series for being a "faithful" adaptation of Sir Arthur Conan Doyle's novels - despite being updated to a contemporary setting.

Sherlock - A Scandal in Belgravia will be broadcast on BBC One on New Year's Day at 8.10pm.