Season 1 was filmed on location. However season 2 was filmed at Pinewood Studios in a reconstructed set. Which is also why you do not see the exterior of the building from here onwards
Abigail Docherty played 2 characters in the series. Suzy Norton the chess genius in 'Picking Up the Pieces' (2.2) and the voice of Mary Bryant in 'The Rest of My Life' (2.10)
Spike and Lynda's relationship in the series grew out into a real one for Julia Sawalha and Dexter Fletcher. They were an item for several years and even lived together before going their separate ways.
Angelo:
So why not you and me then?
Lynda: Let me be totally clear: you sweat, you make sucking noises when you breathe, and your body odor is even now rotting my nasal lining.