The first 2 series were the most gripping and original t.v. I ever watched.
But script writing “lost” its way quite soon after and the shows producers obviously couldnt find a way of wrapping up the show up in any meaningful sense so continually resorted to a load of flash back / flash forward bollox
If it had had a finite lifespan of 3-4 series with an ending decided from the start it could have been one of the best shows ever.
Still pretty good though , just dont bother watching any of it after series 3.