What's different with lessons and tests for "key workers" ?

The body (NASP) being guided direct from the UK Government's driving agency (DVSA) has made clearer what's new because of anti-virus restrictions :

Driving test content remains the same.  However, not all "key workers" will be necessarily be granted a Critical Worker driving test.  At the moment, tests are being offered ONLY to front-line staff in  [1]  the NHS and  [2]  emergency services.  As such, instructors should give lessons ONLY to these people and if they're near test standard.  So :
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• Ask critical.worker.driving.test@dvsa.gov.uk to confirm you will be granted a test
• Tell me before each lesson that you've not been exposed, or are feeling symptoms possibly related to Covid-19, or have travelled recently from an affected region
• Wear safe clothing such as long sleeves and full-length trousers; consider gloves

• Test centre choice will be restricted, as examiners will have to volunteer to work (because they need to break social distancing rules)
• You'll need to wash your hands at the test centre before a test can start
• Examiners may supply L-plates marked "NHS" (to avoid abuse from the public)
• A test will not go ahead—or continue—if clear viral symptoms show up
• Examiners will wear gloves and thoroughly clean everything they touch
• You cannot have an accompanying passenger with you, or during debrief

A register of trainers for key workers will soon be available.  It will allow instructors (like me) to display a certificate.  Police officers, and the public, can then see the training is essential.

Instructors applying to be certified will have to complete a short online course and theory test on safe training protocols.  They will also have to show they are training key workers.