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Sweeney! and Sweeney 2
Unusually, from memory Sweeney 2 is the better of the 2 films, but it's a while since I saw them now. Sweeney has Barry Foster in who played Van de Vaulk and was in Frenzy, my favourite Hitchcock film.
If you go online there is the Pilot to the series in the form of a film which I think was called Regan and you can cast it to your TV . I think it's about 80 minutes long. It's worth a watch too.