Pension-led funding is regulated and overseen by several official organisations

Please find below a list of resources you might find useful

Financial Conduct Authority (FCA)
  
Financial Conduct Authority (FCA) website
FCA – Consumer Protections
  
FCA – Consumer Protections page
Financial Ombudsman Service
  
Financial Ombudsman Service website
Financial Services Compensation Scheme
  
Financial Services Compensation Scheme website
The rules of self investment through SSAS and SIPP can be found on HMRC website