This Practice Note is one of three that provide an overview of the prudential regulatory framework applicable to UK life and general insurers and reinsurers that fall within the scope of the Solvency UK framework, which is derived from the Solvency II Directive (Directive 2009/138/EC) (Solvency II). This Practice Note considers how the key elements of the Pillar 1 quantitative requirements are reflected in the Prudential Regulation Authority (PRA) Rulebook, including: • the valuation of assets and liabilities, including technical provisions for insurance liabilities • regulatory capital requirements, including the solvency capital requirement (SCR), the minimum capital requirement (MCR) and technical provisions for insurance liabilities • own funds requirements, comprising basic own funds and ancillary own funds • investment requirements, including the prudent person principles (PPP) For an introduction to the prudential requirements affecting UK insurers, see: Prudential requirements for UK insurers—introduction. For information on Pillar 2 (governance and supervision) and Pillar 3 (reporting and disclosure), see Practice Note: Prudential requirements for UK insurers—Pillar 2 and Pillar 3 requirements. Pillar 1: quantitative requirements