I used to watch the show with my family as a kid in the early 80s. The episodes we are watching now were made in 1978, about 40 years after they are set. What's freaky is that the lag from now back to when the episodes were made is nearly 40 years.
I have an idea for a self-help book for men. The idea is that there are three basic types; Siegfried, James and Tristan. We are all a delicate blend of these three types, with one or another dominant. The book will teach you how to quit smoking, get out of your endless cycle of failed affairs or get over your tweed addiction, by gently tweaking the degrees of Siegfried, James and Tristan within.
All you need is a my book, gumboots, a tin bucket of warm water and soap, a fell and/or dale, and a cow with non-specific diarrhoea.