This document is the Federated Architecture Blueprint for DARE UK. It defines a potential approach for an overall architecture for a network of sensitive data sources and secure analytical services in terms which are broadly—and deliberately—technology neutral. Choices of implementation technology are not dealt with here, nor are details of costs, benefits and delivery plan. This document covers architecture version 2. It refines the model of a federated network infrastructure from the “initial” and “interim” versions, builds further on the “data layer” and most significantly draws in lessons and learnings from the 2023 DARE UK Driver Project programme.