Wot FFF says.
Definitive Chapter and Verse
here. These are the Regulations. There have been some attempts to "interpret" them in the past.
(ii) within the 12 months preceding the expiry of the rating complete 12 hours flight time in a single engine piston aeroplane or touring motor glider including:
(A) 6 hours of pilot-incommand time;
(B) 12 take-offs and 12 landings; and
(C) a training flight of at least one hour’s duration with a FI(A) or CRI(A). This flight may be replaced by any other proficiency check or skill test .