This SS 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/2016/ring-fenced-bodies-ss

Related links

Allocation of Responsibilities
Internal Capital Adequacy Assessment
Interpretation
Senior Management Functions
PS29/17 - Recovery planning https://www.bankofengland.co.uk/prudential-regulation/publication/2017/recovery-planning