David Tennant and Neil Patrick Harris have been seen filming Doctor Who in Bristol today for the show's 60th anniversary episode. Eager fans crowded into Baldwin Street and Clare Street in the centre of Bristol to watch the production. During filming, some cars were set on fire, and vehicles bearing the logo of Unit, a fictional United Nations agency, have also been spotted. David could also be seen protecting the occupants of a car, while crowds of people were running away. Watch a clip of filming below: The BBC confirmed last month that David Tennant and Catherine Tate are returning to Doctor Who for the show's 60th anniversary. The beloved pairing have reunited with showrunner Russell T Davies for the first time since David Tennant's final episodes, The End Of Time Parts 1 and 2, which aired in 2009 and 2010. David, of course, made an appearance in the 50th Anniversary special The Day Of The Doctor, alongside Matt Smith, Jenna Coleman, Billie Piper and John Hurt. He and