I would imagine where people are based will play an important factor in who they are interested in. If the BBC is based in London they are not going to want to travel to Manchester every time they film and vice versa.
I must admit that I would never invite the BBC into play in my garden as I would spend too many sleepless nights worrying about whether or not my seed was germinating and how ugly I would really look on TV.
They say TV puts 10lb on you but I am sure that it brings out worry lines and stress points too
Jax