On Monday, 9th September 2019 the British Broadcasting Corporation announced that they have commissioned a 10-episode eighth series of the popular crime drama to be broadcast in 2020 and a 10-episode ninth series to be broadcast in 2021.
Writers were given the choice of adapting an existing story or to come up with an original idea. Half of the first series were made loosely based on Chesterton stories. The Chesterton stories were set all over the world and at different times, but a decision was made to anchor the stories in a fixed place and time.
Filming takes place in the Gloucestershire village of Blockley using the church of Saints Peter and Paul (Church of England) as the St Mary Roman Catholic church of the series and the vicarage transformed into presbytery for Father Brown's residence. Other villages used are Winchcombe, Upper Slaughter, Kemerton, Sudeley Castle, and at Winchcombe railway station on the heritage Gloucestershire Warwickshire Railway. At Sudeley Castle, the tithe barn and St Mary's Chapel are used.
Mark Williams declined to return for the 20th anniversary special of "The Fast Show" due to commitments to this series.
The red roadster that Bunty drives is a 1951 Sunbeam Talbot II Coupe, 4-seater convertible. White interior with red piping accents.
Mark Williams glasses reflect purple in direct light. That indicates they have an anti-reflective coating.
The dog in season 1 episode 8 titled, "The Face of Death", is the same dog who appears in the series Doc Martin. The dog's real name is Dodger. Neither the dog nor his handler/trainer appears in the credits of Father Brown, but does appear in the credits of Doc Martin.
In S5E14, Father Brown calls his bicycle "Bucephalus" it shares the same name as the horse of Alexander the Great. Father Brown added that his bicycle was not rusty.
Generally, each individual story stands on their own and can be viewed in any order as each story is independent of any other. (Exceptions are the stories involving Hercule Flambeau, and rarely others.) The dates of the stories are not linear. For example, there is a newspaper dated August 31, 1953 in S7E1 (The Great Train Robbery), but in a later story (The Scales of Justice, S8E3), Bunty's trial is conducted on July 25, 1953, even though the later date was in an earlier series.