Don't vote cold just because you don't like Doctor Who! The Trial of a Time Lord was released in August 2008 at around £50 and I have been waiting for the price to come down. It is currently for sale at WH Smith in store for £30. Next best is £35 at Amazon.
It is a four-DVD set and stars Colin Baker as the Doctor, the assistant is Peri for the most part until the introduction of .......Mel.....ARRRGHHHH!!