Big Finish has announced a new companion for the 6th Doctor and it is former Spooks/MI5 star Miranda Raison. She will be playing Constance Clarke and she will be making her debut in the Autumn of 2015 for a three story arc. Here is a brief description from Alan Barnes.
“Mrs Constance Clarke is a Leading Wren in the Women’s Royal Navy Service (WRNS) and she served at Bletchley Park, in the famous Code & Cipher School, during World War II. The precise details of when, how and why her path first crossed with the Sixth Doctor’s must remain strictly classified for now – but all will be revealed in time...!
Miranda Raison has been in Doctor Who before in the David Tennant story Daleks in Manhattan and Evolution of the Daleks along with many other Big Finish productions. To read the full press release follow the link below to the Big Finish website.