The detail is in the small print:
fly the aircraft for the purposes of check flights and continuation training to any members of the group and for a suitably qualified pilot to fly the aircraft after the annual has been concluded
This does not mean that if you lend your pride and joy to your instructor so that he can teach a non-group member that he is covered.
Similarly if you ask your friendly "instructor" to fly the aircraft whilst you snap pix of your house - he is not covered