In 1932, Lord Peter Wimsey and his valet Bunter were in Scotland on holiday when they assisted the police in a case dubbed "The Five Red Herrings". Among the policemen involved was Sgt. Dalziel (which is pronounced somewhat like "Dee-el").
It's the Toobworld Central theory of relateeveety that he was the grandfather of Yorkshire Detective Superintendant Andy Dalziel, as seen in the series 'Dalziel & Pascoe'. (From Wikipedia: Detective Superintendent Andy Dalziel is described by the actor who portrays him [Warren Clarke] as 'a perfect pig', who is politically incorrect and often insensitive. He likes to do things in the old fashioned way.)
By 1932, Sgt Dalziel could have had a son nearly old enough himself to soon get married and perhaps then move to Yorkshire. For some reason, the name of Andy Dalziel's father is engraved on a memorial in Sheffield. It may have had something to do with World War Two.
Of course, the scripts for the 'Dalziel And Pascoe' series could bleep this all up. Andy's father could have shown up, looking nothing like the actor who played the Sergeant; mention might have been made as to his profession. But it would have to be something from the TV series that would derail this theory. Whatever happened in the novels doesn't apply, even though it's the stated intention of the author.
What happens in the novels is part of the literary universe only, and that's more the purview of Fletcher Pratt and L. Sprague DeCamp of the "Incompleat Enchanter" series. Toobworld is the TV Universe and never the twain should meet. (Especially since the novels apparently have a sci-fi bent not seen in the series - or so I'm informed by Wikipedia.)
And based on the liberties taken in most TV adaptations from their bookish sources, they never have that much in common anyway. (For a good example, read "At Bertram's Hotel" by Agatha Christie, and then watch the second TV adaptation of the stories, featuring Geraldine McEwan as Miss Jane Marple.......)
I suppose by extension through the connection to Lord Peter Wimsy, this theory of relateeveety could be considered a minor part of the Wold Newton Universe as well. But I'll leave that up to Win Scott Eckert to decide; the WNU is his bailiwick and he does a fantastic job in maintaining it. (Far better than I do with Toobworld!)