Watch carefully during the first scene. When Lee picks up the bottle of "braindead" he takes off the lid. When Lucy takes the bottle from him the lid Is back on. Throughout the scene the bottle lid is constantly off/on. Before Lucy pours the drink she takes the lid off, as in the previous shot the lid was already off.
Lucy, while at the flat, states she is in Bedfordshire, however Bedfordshire is nowhere near London, let alone the London Docklands where (as stated in "Mortgage" and "Amy") the series is set.