After talking about him having a fake job in Plymouth and having to go on a road trip, Jane & Davey go to meet Ian Igby's probation officer at Plymouth Batten Water Centre. It is implied by the previous conversation and the shots of the River Tamar and Royal Albert Bridge that this is located in Plymouth, however the distinctive Union Jack building shown in the background is located on the Cornish side of the Tamar at Saltash. They would never name anything after Plymouth in Saltash.