 Penelope Wilton reprised her role as Harriet Jones to film a scene on 18 March , in a cottage in Dinas Powys . Filming was stalled because of difficulty transporting the Dalek props into the cottage : specifically , the raised patio doors made it difficult to balance and maneuver the props . The remainder of the fifth week was used to film Dalek @-@ only scenes at Upper Boat Studios , when the Vault set was redressed as the Crucible command deck . Scenes that featured Martha and Sarah in their houses were filmed alternately during the sixth week — the former in the previously regular location of Lower Cwrt @-@ Y @-@ Vil Road in Penarth and the latter primarily at Upper Boat — ending on 28 March with scenes of Sarah and Luke in their attic . The last exterior scene filmed for the episode was recorded on 25 March in the regular The Sarah Jane Adventures filming location of Clinton Road in Penarth , and consisted of external shots of Sarah 's house and two Daleks accosting Sarah en route to meeting the Doctor . General filming for the episode — and the two @-@ parter — closed with Dawkins ' and O 'Grady 's cameos : Dawkins was filmed at Upper Boat after shooting finished in the attic set ; and O 'Grady was filmed on 31 March alongside an episode of The Paul O 'Grady Show at The London Studios on the South Bank of the River Thames . 
