De BBC America - Cinco coisas bizarras sobre o britânico Televisão :
The Six Episode Season
Most British drama or comedy shows have a very short season. The classic amount for comedies is just six episodes per series – The Office being a prime example – and there’s one very good reason for this.American comedy is a producer’s medium, in which an idea is worked up, characters developed and early scripts written, and then the show is handed over to a larger group of writers to flesh out into actual scripts.
British comedy is a writer’s medium. The scripts are almost always written and developed by one or two people, then taken to production. Graham Linehan, the writer of Father Ted and The IT Crowd, even directs his own scripts, which is a LOT of work.
De TIME Magazine - O que os EUA podem aprender com a TV britânica :
There are underlying economic reasons for the two different models.
The goal of almost any American commercial series is to air at least 100 episodes, because that’s when it can be sold into syndication and aired as reruns on other stations or networks. That’s where the real money is.
But the BBC is publicly financed, so not every show has to earn its investment back with a multiseason run.
De TV Tropes - British Brevity :
British shows usually have a fairly small creative team.
It's not uncommon for one person to single-handedly write every episode of a show, as Steven Moffat did with Coupling, or David Renwick with Jonathan Creek.
There's more pressure to succeed, and less of a chance to make a lasting impression or develop long plot arcs. Ruin two episodes and that's a third of a season down the tubes. Some American shows that start off weak can grow their beard when the show would have long been over in the UK.
On the other hand, British shows tend to have the entire series filmed before broadcast, so shows are rarely canceled mid-season, or affected by events like a writers' strike.
Outra coisa a ter em mente é que o Os EUA têm 114 milhões de residências de TV , enquanto o O Reino Unido tem 26 milhões . Menos espectadores significa que há menos dinheiro a ser feito. E menos dinheiro significa menos episódios.