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The BBC have very strict guidelines about what those lucky journalists are allowed to say after watching a preview of a Doctor Who.

And when it comes to the series 8 finale, Death in Heaven, there's a list as long as your arm on things we're NOT supposed to say in case the episode is spoiled for you.

So trust me when I say I will not divulge anything about Death in Heaven which I feel could or would ruin the finale.

But if you want to know NOTHING – and in NOTHING AT ALL - then stop reading now.

Turned away yet? You have been warned.

What I can say is that you will need the following when you watch it: A box of tissues, the James Bond back catalogue, a stiff drink and long discussions with your nearest and dearest about whether it's ever OK to lie.

The entire episode, in fact, hinges on that last little issue – but I'm not going to reveal just how little white lies colour Death in Heaven. That simply wouldn't do.

What plays out between the Doctor and Clara will, however, leave you if not in tears then totally, utterly and wonderfully emotionally drained.

It's deep stuff; for a man with two hearts who's not from these parts, it's the most human of touches and such a fitting end to the series.

As you'd expect, all the questions that you had at the end of last weekend's Dark Water will clear.

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However, there is still room in the script for plenty of drama for the Christmas special to play out.

I'm not going to tell you what happens to the psychotic Mary Poppins character that is Missy, but what I can say is that the chemistry between Michelle Gomez and Peter Capaldi is mesmerising.

You'll see lots of old faces reappear, as you can see from the gallery above, but what they do and how big a part they play will have to be kept for you see play out on Saturday night.

Dark, brooding and brilliant, it's in my all time favourite top 10 Doctor Who episodes.

It's got everything you ever wanted for an ending, and so much more.

The Doctor Who finale is on BBC One on Saturday at 8pm