To call this a golden nugget is a bit of an understatement. I think for my money this is probably the strongest of all the series's, with a lot of the best episodes on it for example: 'Just Desserts' (the one about the missing pineapple chunks which probably rates as the best known episode ever), plus 'Disturbing The Peace' (the surprisingly likeable, but yet, still a complete b*stard Mackay gets sent on a course and is replaced by an even bigger b*stard of a governor) and 'No Peace For The Wicked' which is about Fletch quite simply needing some quality time on his own and not getting it. Porridge was so strong, that I could practically rate nearly every episode from every series as one of my favourites, as it's all five star stuff.
To top it all off, as one reviewer has mentioned, you even get the pilot 'Prisoner & Escort' which is a well written and very touching episode, that only features the three characters of: Fletch, Barrowclough and Mackay. Even at this stage, before the series had been commissioned, this was already a fully formed comedy classic. Credit to the writers Dick Clement & Ian La Frenais, plus credit to anybody who owns this on DVD.