Episode #4.7 - S4-E7
Factual error: In this episode Blackwall Station is shown as a London Underground tube station. Blackwall Station is a Docklands Light Rail (DLR) station. Also look at the destination sign on the front of the train, which reads 'THAMES LINE', No such line/station exists on the London Underground.
Factual error: In series 13, when phone numbers are referred to, they usually start 0808 (even mobile numbers). UK phone numbers starting with those numbers are freephone numbers and wouldn't be used for private use, or even for mobiles (which all start with 07).
