I rather enjoyed this show. Though some of the characters takes a bit getting used too, it was overall a good show.
And I actually had to check out if this was for real or scripted with professional actors, because sometimes its almost too insane.
For the record: It is real
But that said, I think 5 episodes is enough, any more would just be milking it.
Watch it if you can, I'd say its worth your time.
The show is about: (this is cut'n paste from the BBC three page) Fly-on-the wall-documentary following the ups and downs of call centre CEO Nev Wilshire and his staff of extraordinary characters.