nitially, it will allow faster access to the services on the app, which is separate from the contact-tracing one.

But its developers say it could also be used for Covid-19 "immunity passports".

Such passports, where people carry documented proof they have immunity because of a past infection, are already being tested in Estonia.

Health Secretary Matt Hancock has previously hinted at the possible use of a "system of certification" for those with antibodies for coronavirus.

The NHS facial-recognition system, built by iProov and available in England for both Android devices and iOS, requires users to submit a photo of themselves from an official document such as their passport or driving license.

The system scans a person's face using their phone and, following a short sequence of flashing colours, their identification will be verified and they will have access to all the services on the NHS app.

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