This review seems to be of academic code for an epidemiological model, rather than anything to do with the app itself? The 2 apps are in Kotlin and Objective C, rather than C++.
In my weak defence, it's not often we get two bits of code open sourced in a week relating to UK government policy.
There's actually some quite nice (open-source and reusable) guidance/handbooks etc. on remote working and security from the Ministry of Justice [2]. Probably not nearly as well advertised as it should be. Clearly won't meet everyone's needs, but there's a lot more out there than people probably realise! :)
[1] https://github.com/ministryofjustice/hmpps-book-secure-move-..., https://github.com/ministryofjustice/correspondence_tool_sta..., https://github.com/alphagov/govwifi-admin etc. [2] https://github.com/ministryofjustice/security-guidance