Genuinely curious about where you read that the UK has no energy security? It's not something I've read about before, but is something I'm pretty invested in as a UK citizen.
The one source I could find was https://www.globalenergyinstitute.org/energy-security-risk-i... which placed the UK in the top 3 countries for energy security (many years running).
Do let me know if you have some data that would change my mind! (and ditto for food security)