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I live in the UK and nothing you’ve said here is congruent with my experience. I don’t recall ever being in any building whatsoever that had no indoor toilet, including pubs.
In the past. A long way in the past.
The move to the later half of the 20th century was 70 years ago.
Near where my sister lives on the edge of Bristol there are several pubs with outdoor toilet blocks. It’s usually country pubs or ones old enough to be listed. You’re not going to find many in cities these days.