Revalidation (as opposed to renewal) requirements are shown here;
- Pass a proficiency check in a single-engine (single-pilot) aeroplane with an examiner. The proficiency check must take place within the 3 months immediately before the rating’s expiry date;or
- 12 hours of flight time in single-engine (single-pilot) aeroplane within the 12 months preceding the rating’s expiry date, including the following:
- 6 hours as pilot-in-command (PIC)
- 12 take-offs and landings
- a training flight of at least 1 hour (or a maximum of three totalling 1 hour) with the same flight instructor or class rating instructor. If you have already completed a proficiency check or skill test in another type or class of aeroplane, you will not have to complete this training flight.
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https://www.caa.co.uk/General-aviati...or-aeroplanes/
However, even this CAA page is not up to date. Any number of instructor flights with any number of instructors for any purpose adding up to at least one hour is now acceptable. There is no requirement for a test of any sort, just one hour of instruction in the second 12 month period, but as indicated a separate test or proficiency check is also acceptable.
Ah, found it. Paragraph ten of second page here.
http://publicapps.caa.co.uk/docs/33/...ter%202019.pdf