See LASORS C1.1, 1.2 and 'Credits for Previous Experience and Training' for full details.
http://www.caa.co.uk/docs/33/srg_lts...Bookmarked.pdf
Any previous flying experience gained in TMG aircraft (i.e. Vigilant) may be counted towards the 45 hour minima required for the grant of a JAR-FCL PPL(A) with TMG rating. However the specific requirements under JAR-FCL (25 hours dual instruction and 10 hours supervised solo-flight time) must be completed. Individuals who have already met the 45 hour experience requirement will be required to complete discretional flying training, at a Registered Facility or Approved FTO one crosscountry flight of at least 270km (150nm), during which full stop landings at two different aerodromes different from the aerodrome of departure shall be made, and pass the PPL(A) Skill Test with a CAA Authorised TMG Examiner. Individuals who then wish to obtain the SEP rating will be required to complete an SEP Class Rating Skill Test.