Episode #4.2 - S4-E2
Factual error: Ram says he has two "Chief Constable's Commendations" (which are also shown on his office wall). He has spent his entire career in the Metropolitan Police, which has a Commissioner instead of a Chief Constable.
Unforgotten (2015)
1 factual error in season 4 - chronological order
Starring: Nicola Walker, Sanjeev Bhaskar, Jordan Long, Lewis Reeves
Episode #1.1 - S1-E1
Factual error: When reviewing the phone numbers in the 1970s diary, they start '01' which was a change to UK numbers only brought in 1995.
Upvote valid corrections to help move entries into the corrections section.
Suggested correction: The 01 prefix for London was introduced much earlier. We had one in the 1960s.