One last issue is whether the government would allow third-party apps to tap into its system to offer specialised vaccine certificates of their own.
These would be customised for use in certain workplaces or leisure activities, where the details could be stored alongside ticketing or other relevant non-health-related data.
Identity-check technology provider iProov, whose face-scanning software is already integrated into the NHS app, is among those keen to do this.
Its chief executive, Andrew Bud, pointed out that the NHS already had a mechanism to allow private apps to tap into GP records subject to strict security requirements.
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.