Tennant and Tate's Chain Reaction

Catherine Tate will be heard interviewing David Tennant on BBC Radio 4 on February 21 when Chain Reaction returns for a new series.In it, they talk about working on Doctor Who - as well as playing extras on The Bill.The show's format sees the interviewee becoming the interviewer of a different guest the following week, with them talking to people whose work they admire and appreciate.Next week (February 28), Tennant will be interviewing Richard Wilson, who played Dr Constantine in The Empty Child and The Doctor Dances, while Wilson's interviewee the week after that (March 6) will be Arabella Weir, who used to lodge with Tennant and made him godfather to her youngest child. Weir also played the Doctor in the Big Finish drama Exile - which featured Tennant playing an unnamed Time Lord and a pub landlord. (Weir will round off the series of Chain Reaction by interviewing fellow Fast Show star Paul Whitehouse.)The half-hour programmes start at 6.30pm. The series was recorded last year.