Thanks. I was expecting a less UK familiar audience, I've over simplified the problem semi-deliberately, largely to avoid falling into discussing the general me

Thanks. I was expecting a less UK familiar audience, I've over simplified the problem semi-deliberately, largely to avoid falling into discussing the general mess that is NHS IT. :) My first job probably 20 years ago now was on a Radiology Information System so while probably out of date (though that RIS is still deployed widely so maybe not) I've got some idea of the types of issues, including around NHS numbers. I guess I'm only aiming for that extra layer of Swiss cheese in whatever initial subset of the plethora of systems it could cover. I've also tried taking systems through NHS innovation programmes in more recent years. That's been a whole other level beyond what I experienced with the RIS, all the same issues plus fighting for funding from people who told me they wanted off the shelf and not anything new (or, it seemed, innovative). And I don't need funding so I'm loathe to go that route but I can't dismiss it, it's an option.