Yes, 21 (2008) is free to watch on Rakuten TV in the UK with no subscription required.

Where can I watch 21 in the UK?

21 (2008) is available to stream on Rakuten TV, Netflix in the UK.

Is 21 on Rakuten TV UK?

Yes, 21 (2008) is currently available to stream on Rakuten TV UK.

Yes — it's on Rakuten TV

Available to stream now

21 (2008)

PG-13Astrology, Crime, Drama· 2h 3m· ★ 6.8

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About

Inspired by real events and people, 21 is about six MIT students who become trained to be experts in card counting in blackjack and subsequently took Vegas casinos for millions in winnings.

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Frequently Asked Questions

Is 21 free to watch?: Yes, 21 is free to watch on Rakuten TV in the UK with no subscription required.
Where can I watch 21 in the UK?: 21 is available to stream on Rakuten TV, Netflix in the UK.
Is 21 on Rakuten TV UK?: Yes, 21 is currently available to stream on Rakuten TV UK.