What beer is called Numbers in the UK?

Watching the Detectorists and a round of drinks was brought to the table.
The server said, Cider, Numbers, Numbers handing the two beers to the guys and an Aperol Spritz for the good wife.
Why Numbers?

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whowasthatmaskedman · 70-79, M

I did a little digging and came up with this.
"I believe it means a pint of Kronenbourg 1664 (the ‘numbers’ referring to the 1664’.)"
Now thats from the same question asked on Reddit some years ago.😷

Gusman · 61-69, M

@whowasthatmaskedman Okay, thank you for that.
Shall we have a couple of Numbers? 😄

SW-User

@whowasthatmaskedman Ah. Okay...thanks and makes sense!