However, he has not completely ruled out revisiting the story in the future.
He said it was the right decision to end the series with season three but still felt gutted.
Speaking to PA he said: “I said to Netflix, ‘I’ll do one if the second series goes down a storm’, and I kept to that.
“I fell in love with this. And, secretly, for the first time ever, I did want to do a third, and I’m gutted that I’m not doing a fourth, really. But it’s the right decision.”
He explained that artistically, it was right to end the series on a high.
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