Discs incorectly labeled CAV - all sides are CLV, as per the sleeve art.
This set is of a slightly different cut than the broadcast version. Alternate episodes have slight changes: different takes, extended or shortened dialog, the final intro (about evolution and lunchtime) is new.
Originally mono, this set features a synthetic stereo mix. Not really a stereo remaster, sounds like a bit of reverb and slightly shifted phase for the effect.