AND so, one of TV’s all-time top dramas – and perhaps best-kept secrets – rushes headlong to its conclusion, and it’s as gritty and doom-laden as you’d expect.

A series that was never afraid to bump off major characters has no problem with losing them at the end of its run, and the tension mounts spectacu-larly.

The final ending could never please everyone, but it ties up loose ends with an extended epilogue to put Lord of the Rings to shame.

But overall it’s a cracking last run of episodes that includes two of the finest this excellent series has ever produced.

The best sci-fi show of all time? So say we all...