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It's this one, in 20mm / short length. https://unlimitedstraps.com/collections/seiko/products/the-classic-gl831-rubber-diver-strap-19-20-21-22mm-1?variant=44773313708313
They do other colours but they're not readily available in the UK right now, and if you get them shipped to here they're more expensive. Their official site looks like a UK shop but it's not, they ship from the US:
https://unclestraps.com/en-gb/products/the-classic-gl831-rubber-diver-strap-20-22mm
Unlimited Straps used to be their UK shop but they were forced to change their name (the brand was formerly known as Uncle Seiko).
Happy Friday folks. This short length Uncle Straps repro rubber is such a winner. No more excess strap tail and even the buckle is really nicely done (smooth, nice finish, no ugly logo).