During an interview to promote her first novel on the ITV daytime chat show Lorraine, Mel Giedroyc revealed that Unforgivable would return for a second series, that filming was scheduled to take place at the end of June/start of July 2021 for broadcast on UKTV's comedy-orientated channel Dave in Autumn 2021. She also invited the chat show's host Lorraine Kelly to appear on Unforgivable.