Father Brown season 12 episode 10's cast includes a number of recognisable guest stars so who is to feature in the grand finale?

Father Brown season 12 is almost over with a plethora of familiar faces starring in the 10th and final episode.

Who is Marty Lagina married to? Learn more about his wife, how they met, what she does, her career background, financial life ...

Broxburn Uphall WInchburgh (West Lothian) by-election 1st prefs (vs BE 22 / full 22):SNP: 1375 (31.8%, -3.4 / -8.2)Lab: 1263 (29.2%, -10.6 / +0.9)RUK: 809 (18.7%, new)Con: 324 (7.5%, -0.3 / -9.5)LD: ...