I don't think the British film industry is doing itself any credit by still releasing late 50s films on DVD or sending copies to TV companies in 4:3 format. Whilst these films were probably shot exposing the 4:3 frame, they were intended for seeing in the cinema in 1.66 (or 1.85) and with Widescreen TVS now the standard, I feel the audience is being shortchanged.
Today Film 4 was showing A NIGHT TO REMEMBER in 4:3 (and that's from 1959). Other films it has shown recently in 4:3 include THE YANGSTE INCIDENT (1957), I WAS MONTY'S DOUBLE (1958) and THE DANGER WITHIN (1959).
I saw a DVD for THE PRINCE AND THE SHOWGIRL (1957) which I was thinking of buying having just seen MY WEEK WITH MARILYN but changed my mind when I saw it was in 4:3. I have also seen a Terry-Thomas Box set of 3 movies all in 4:3.
If a film was made for showing in 1.66, then I want to see it in 1.66 whether on TV or on DVD. That seems reasonable to me but apparently various British film companies think otherwise.