Bit in bold - the facts don't support.
In 2019 (so pre Covid) only 2 European countries had a higher passenger KM travelled per year than the UK - France and Germany.
The UK was over 50% more than Italy, more than 3 times more than Spain.
In terms of passengers carried - so numbers using it, the UK again was 3rd behind France and Germany - bearing in mind Germany's population is 20% greater than the UK's it would be somewhat difficult to match German numbers. France has a similar population and carries about 2% more passengers - bearing in mind France is twice as big as the UK, there will be some long-distance travel there which the UK has no call for.
en.wikipedia.org
Even if you look at rail's "modal share", the UK is 9th among European countries - on a par with Germany. And ahead of most of Scandinavia as well as Italy, Spain and Portugal.