As smaller ‘not-for-profit’; organisations, Scout Groups, Districts, Counties/Areas/Regions (Scotland) do not have to register provided they do not hold personal data about anyone other than members or potential beneficiaries. However, they are still subject to the rules of the Data Protection Act and the General Data Protection Regulations (GDPR). As a larger organisation, The Scout Association UK Headquarters is registered as a Data Controller with the ICO.
Please see POR Chapter 2 and the guidance available to Scout Groups, Districts, Counties/Areas/Regions (Scotland) online.