The Financial Conduct Authority (FCA) website contains useful information about how pensions scams work, how to avoid them, and what to do if you suspect a scam.
In addition the attached leaflet, issued by The Pensions Scams Action Group, has a checklist to go through if you are ever approached about your pension. Scammers appear professional and it's becoming increasingly harder to spot the difference between something that's credible and something that's fraudulent.
The Pensions Scams Action Group (January 2025)