The current "real world constraint" is purchasing gas from Russia.

Yeah, nuclear is better than that.

The thing Ive never quite understood is that the UK has no domestic supply of uranium.

Almost all of Europe has stopped buying Russian gas? The exception being nuclear powered France. [1]

You also do know that we despite 19 sanctions packages still haven’t been able to sanction the Russian nuclear industry? We’re just too dependent on it.

[1]: https://www.highnorthnews.com/en/eu-talks-tough-russian-lng-...