The British Phonographic Industry, abbreviated BPI, certified “Rein Me In” 3× Platinum in the United Kingdom.
BPI is the UK recorded-music trade association and the body whose certification appears in the song’s UK certification listing. The 3× Platinum entry is separate from certifications issued in other markets: ARIA covers Australia, Music Canada covers Canada, and the RIAA covers the United States.
The song is credited to Sam Fender and Olivia Dean. Their version followed a live performance at London Stadium in June 2025 and became an official release later that month. It was subsequently associated with major UK chart success, including Fender’s first UK number-one single.
A frequent mistake is to choose another certification organisation simply because the song also earned awards or certifications internationally. The question asks specifically about the United Kingdom, so BPI—not ARIA, Music Canada, or RIAA—is the relevant body.