The only time Albert Campion was ever really adapted for the visual medium a handful of times. The most well-known was the one produced by the BBC from 1989-1990 starring former Doctor Who star Peter Davison.
And Davison was wonderful as the amateur sleuth whose name and past are very questionable. Albert Campion is not even the character's real name. Just one of many aliases to protect the true identity of his possibly aristocratic family.
Sadly, there has not been a series made about the character since the Davison series. Which I think is a crying shame.
Much like Sherlock Holmes, Hercule Poirot and Lord Peter Wimsey, he's one of the great eccentric character who really wasn't intended to be the star when creator Margery Allingham wrote his first tale CRIME AT THE BLACK DUDLEY. She had written him to be a parody of Lord Peter Wimsey. But much like Inspector Clouseau in THE PINK PANTHER (1964) Albert Campion turned out to be the break-out character of that tale, overshadowing the character of George Abbershaw. Whom it seemed like Allingham was grooming to be the star. Or at least from the amount of time he had in the book over Campion, it did appear Allingham had a series of novels with Abbershaw in mind.
Her descriptions of Campion were less than flattering in either BLACK DUDLEY or his follow-up adventure MYSTERY MILE.
I think Albert Campion's return to television is long overdue and I think outgoing Doctor Who star Matt Smith would be ideal for the role.
At 31, he's the right age for the role. To me, his Doctor really has shades of Albert Campion. Both appear to their enemies as prattling idiots and slightly unhinged. However, all that is just a facade to hide their true brilliance.
AND his Doctor has adopted a somewhat "owly" look as of late. Much like Campion.
As for the series itself, perhaps a three episode run per series like SHERLOCK would not be a bad idea. Yes, it's frustrating to wait so long for three episodes. But somehow the shortened series has really benefitted making those three episodes per series really memorable. If they go in that direction the series should start off with a proper adaptation of CRIME AT THE BLACK DUDLEY. Followed by MYSTERY MILE and LOOK TO THE LADY for series one. Then POLICE AT THE FUNERAL, SWEET DANGER and DEATH OF A GHOST if there is a series two.
As for the rest of the cast, I'm not sure. But I think Matt Smith would be brilliant if the BBC decided to bring old Uncle Albert back to the small screen.