I believe it pays to search the Internet for DVDs, instead of posting messages such as this. Remember there is also a second hand market for these products.
Yesterday, I bought It Always Rains on Sunday, Digitally Remastered by the British Film Institute National Archive in 2012: 88 minutes running time, mono 2.0 sound, 1,371 image ratio, b&w PAL, Region 2 DVD, HOH subtitles.
Besides the trailer and stills gallery, the DVD has four exclusive interviews and something that may be of particular interest to you, a featurette on the film's locations with British Film Historian Richard Dacre.