Is this not what is being withdrawn?

But still, just going by the link you have a list of principles:

https://beta.nhs.uk/service-manual/design-principles

Which are all well and good, but are more akin to a 'vision' than technical design principles (especially with regard to preference of tradeoffs, data management, priority of platforms etc).

The rest of it seems to be strongly geared towards the web. It may well be that the NHS only wants to collaborate on public-facing web services, much like GOV.UK and the Government Digital Service, but this would need to be either extended or abstracted to be applicable to, say, administrative systems.