My friend and her family were in one of the shows a few years back, can't remember what it was called but it was one where they criticised family spending and gave them hints and tips for savings. The cameras followed them round for weeks, and she said it was a fix - for example she was encouraged to buy wasteful things like DVDs each week, so she could "stop buying" them and save money.
Friend of mine was on Four in a Bed - he has a pub at Newmarket. He came second and got a lot of publicity from it and stayed friends with another couple who won. He said there was a lot more filmed that was not shown and they edited it to make it more entertaining focussing on the dispute between him and another contestant.
That pubs just near me lankeela and the landlords a bit of a show off in a nice enough way, and there were a few regulars not happy while it was being filmed.