HI Mike,
I'm a PowerApps/Power Automate developer based in Bristol working for the Defence facing company, and I also have MoD security clearance that allows me deal with 'Sensitive' data.
I understand you're looking for coders to help build your medical platform, but I'm also wondering if there is an opportunity here to build a PowerApp for you guys using your Microsoft O365 E5 subscription, which I'm assuming you use for your business needs? PowerApps are quite in demand these days as it helps smooth out your current business processes into a well functional App that sits in your company's IT infrastructure. With a project this large, it may be worthwhile for you.
Do let me know if this is of interest.
Kind regards,
Zain