Q: Passage: After the unexpected success of the initial series, ITV commissioned a second series, with Lang returning as writer and Wilson as director. It was shot on location by the River Lea, in the Cotswolds, and along the promenade in Brighton.

Question: Based on this passage, where was the second series of unforgotten filmed? Let's give stream of consciousness first:
The important part for answering this question is: It was shot on location by the River Lea, in the Cotswolds, and along the promenade in Brighton. Therefore, the final answer is by the River Lea , in the Cotswolds , and along the promenade in Brighton.