The NIR service pages contain the foundational knowledge to understand the who, what, when, where, how and why of NIR. The NIR team update the pages regularly, for the most up to date information please see the webpages.
The developer community is a useful resource to discuss things with others, additionally you can reach out to the team if you have any specific concerns that are not currently addressed on the webpages and/or the developer community. https://digital.nhs.uk/services/national-imaging-registry