Why only 8 episodes?

[YourFutureMuse]

Yeh I agree that 6 is definitely too little and I think Spooks is too high octane to go on for too long lol otherwise I think it would end up a little slower if the series was longer than 10. For me 10 was the perfect number to allow a developed storyline with chance to develop characters within the storyline and so as you still don't get bored of it and think it has gone on for too long..