Review of Underworld Informers

I love these sort of films,1950s/1960s British crime films. Some are well known but this one is fairly obscure,despite the well known director and cast.

So I was glad when I caught this on a film channel. It has its faults,mainly sometimes unrealistic,but it is well made and has a great cast. 10 years after this film was made the British film industry was almost dead,why? I think because of tv and the idea that British films were dull,some were but some were great.