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Video: How Do the Discs Look?
I mean, this is a British show from the early 1970s, so one can't imagine that these 1.33:1 transfers would be anything of major note. Detail quality is minimal - smear abounds - and while color accuracy is sometimes impressive, from sequence to sequence it's all over the map. There are also instances of compression artifacting and banding to mention, which don't help things much.

Audio: How Do the Discs Sound?
The Dolby Digital 1.0 mixes are maybe a hair better than Special Branch's video presentations, but it's clear that these tracks haven't been cleaned up all that much. Dialogue, music, effects - every element of the show's sound design has been replicated here with nominal success.
English SDH subtitles are included.