I had made a start on series four of
The Avengers. This was the first series to feature Diana Rigg as Emma Peel.
From the first three episodes it does appear to be a different show. Now using location filming, it doesn't come across as studio confined as it did. There's also the quality of the materials on offer.
The first three series were scratchy affairs hardly easy on the eye with hissy sound but this fourth series is a marked step up. In fact it's practically HD in comparison thanks to the use of film rather than videotape. Beautiful black and white prints with crystal clear sound. Fantastic !