www.macfarlanes.com/what-we-think/in-depth/2020/faqs-the-investment-firms-regulation-and-directive/
dwfgroup.com/en/news-and-insights/insights/2021/8/uk-investment-firm-prudential-regime
www.sidley.com/en/insights/newsupdates/2021/08/uk-investment-firm-prudential-regime-10step-plan-for-investment-managers
Update:
financialregulation.linklaters.com/post/102hgzf/new-notification-requirements-for-fca-regulated-investment-firms-in-groups