SLMG and Microlight on old UK Licence still 5 hours in 13 months
SLMG on JAA Licence as per NPPL.
However, If you have the SLMG on your UK or JAR PPL, you are current and have at least 75 hours, you can pay the nice fellows at CAA to convert it to a TMG rating. You can then use any time flown in SLMG's to keep both ratings current on the same two year cycle as the SEP.
SS