The only British TV show that I know of which *had* seasons was Doctor Who. And that's because it operated, IIRC, on a 26x25min episode formula for most of it's life until 1989, which broke down to roughly five four-part stories and a single six-parter, or six four-parters and a two-parter.
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O to be wafted away
From this black aceldama of sorrow;
Where the dust of an earthy today
Is the earth of a dusty tomorrow!
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