Click here for a Datablog of every Doctor Who villain since 1963
Karen Gillan and Arthur Darvill are squealing like happy toddlers, eagerly rummaging through big carrier bags of CDs on the floor of the Guardian Guide's office. "Hey, The Hit World Of Marthas And Arthurs!" says Arthur, waving a sleeve.
"Definitely have that one," laughs Karen. They both chew gum as they pore over piles of discs, Arthur next picking out a Richard Hawley single. "Who is Richard Hawley?" Karen asks, blowing at her new fringe. Arthur gawps incredulously. When I mention that these CDs are going spare, the noise levels go through the roof. With their time as Amy and Rory coming to an end,