According to the Radio Times, tonight’s episode of Midsomer Murders‘ season 20 “Death of the Small Coppers” is the last one, ITV will be airing for now. The time slot will be taken over by Coronation Street and the new season of historical drama Victoria.
There’s no information as to when Midsomer Murders (including Andrew’s episode “Send in the Clowns”) will return to British TV.
The first two episodes of Midsomer Murders series 20 air in March 2019 […]. A further four feature-length episodes will be scheduled later in 2019, completing the six-episode run.
(Source: Radio Times)