As mentioned this old Southern TV pot-boiler was screened by the now defunct Film24 a few years ago, the property is now occasionally on Movies4Men as a cut down film clocking in at just about two hours including a handful of ad breaks.
Having not seen the series version I can't comment on what's been removed or whether it means the current version is stronger or weaker for that editing but as viewed The Capone Investment proved a quite enjoyable minor work and one that gains some kudos for me for the mere fact Ian Kennedy Martin came up with the idea in the first instance - wondering what happened to the American gangsters millions and then managing to come up with a story that meant it could be filmed by a regional British TV company on its own patch takes more imagination than I have! In the acting stakes its definitely John Thaws show, you can see the proto John Regan in his performance - no nonsense, a threat of violence, he will get his man! The rest are largely perfunctory though Peter Sallis does have "something of the night" about him as the C15 agent attached to the police investigation.
In terms of its production it is very cheap looking, as was the way in the 60s and 70s in house fiction series were often recorded on film when on location and on video for the studio work (sometimes video was used inside and out), when compared to more expensive series of the same era that were shot entirely on film - Space 1999, the Sweeney, the New Avengers etc it looks very crude at times but I suppose that's part of the retro charm!
