I think it was just a single episode as preppers are pretty thin of the ground in the UK.

The Preppers UK; Surviving Armageddon episode, does show some interesting characteristics though, it seemed to be interested in the aspect of hunting and foraging, camouflage clothing and the so called Weapon collections including knives, cross bows and Air guns etc simply by the fact that more 'normal' popular pursuits in the UK such fishing and gardening were pretty much ignored. Again processing wild game was seen as edgy TV simply because the vast majority in the UK collect their meat in plastic wrappers from the Supermarket.

Even with an air rifle in the UK you have to be careful of people observing its carry even out in the countryside or Wilderness. Folks will call armed response police simply because of the perceived threat due to their engagement within the electronic matrix. Air rifles are also excellent for shooting practice as well. When I was a lad, moving from an air rifle to a Lee Enfield .22 to an Enfield .303 was quite rapid. i.e. the 900m range was in use after probably after only firing 40-50 rounds of .303

Doomsday Preppers seems to have taken things to the extreme, from the threat assessments to the solutions to mitigate what is actually a low probability threat in reality, at the expense of normal everyday living. But the TV program is still interesting as I still can't quite work out whether the wackiness is actually due to the folks involved or just the program format, which encourages the wackiness. It should be said though at least many of them have some sort of planning and preparation. In that respect they are ahead of the curve compared to the vast majority.

So I think its best to keep things in perspective, balance the prepping with other training and skills based pursuits and hobbies, which you enjoy whether it is Scuba diving, fishing, golf, bushcrafting, competitive shooting, cycling, wild camping etc with other outdoor pursuits. It sure beats being a couch potato watching the TV 'survivalist' fantasy vicarious thrill shows.