https://www.gov.uk/driving-lessons-who-can-teach-you
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Driving with friends and relatives
You can be fined up to £1,000 and get 3 to 6 penalty points on your provisional licence if you drive without the right supervision.
Anyone you practise your driving with (without paying them) must:
be over 21
be qualified to drive the type of vehicle you want to learn in, eg they must have a manual car licence if they’re supervising you in a manual car
have had their driving licence for 3 years
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Over 21 AND licenced >3 years in this case, Jo?