http://opsi.gov.uk/si/si2007/uksi_20073467_en_1
For SSEA, Microlight and SLMG on NPPL:
(a) The holder has as a pilot, in an aeroplane specified in the aeroplane class rating and within the period of validity of the current certificate of revalidation for the rating–
(i) flown at least 12 hours which includes at least 8 hours as pilot in command;
(ii) completed at least 12 take-offs and 12 landings;
(iii) subject to sub-paragraph (b), undertaken at least 1 hour of flying training with an instructor entitled to give instruction on aeroplanes of that class; and
(iv) flown at least 6 hours in the 12 months preceding the specified date.
(b) Where the holder has not undertaken the flying training specified in paragraph 1(a)(iii) a certificate of revalidation may be issued but must be endorsed “single seat only”.
SLMG and Microlight on old UK Licence still 5 hours in 13 months
SLMG on JAA Licence as per NPPL.