No it's just the way a lot of BBC/British shows have always been made. As said back in 1978 Blakes 7 had 13 episode runs.
Using your 'logic' I could just as easily point out that US shows only have 20+ episodes so they can sell more bloody advertising space and produce enough episodes to go into syndication! Do you think the producers want to make 20+ episodes?
First season of Buffy's great because it's only 13 eps and doesn't outstay its welcome, leaves you wanting more in fact- first season of BSG the same, and yes first season of The Sarah connor Chronicles (which in fact showed a marked decline in quality once they had to produce more episodes.)
Using your 'logic' I could just as easily point out that US shows only have 20+ episodes so they can sell more bloody advertising space and produce enough episodes to go into syndication! Do you think the producers want to make 20+ episodes?
First season of Buffy's great because it's only 13 eps and doesn't outstay its welcome, leaves you wanting more in fact- first season of BSG the same, and yes first season of The Sarah connor Chronicles (which in fact showed a marked decline in quality once they had to produce more episodes.)