This SoP has not yet been added to the PRA Rulebook. It is available on the Bank of England website, here.

https://www.bankofengland.co.uk/prudential-regulation/publication/2024/february/solvency-ii-internal-models-permissions-and-ongoing-monitoring-sop#:~:text=This%20statement%20of%20policy%20(SoP,Solvency%20Capital%20Requirement%20(SCR).

Related links

Solvency Capital Requirement - Internal Models
PS15/24 - Review of Solvency II: Restatement of assimilated law https://www.bankofengland.co.uk/prudential-regulation/publication/2024/november/review-of-solvency-ii-restatement-of-assimilated-law-policy-statement