cmsglider - good news! A BGA TMG guru has reminded me that things have changed for the better!
Commission Regulation (EU) 2015/445 of 17 Mar 2015 has already amended the aircrew regulation, so that the experience requirements may be gained in aeroplanes
or TMGs:
In FCL.210.A, point (a) is replaced by the following;
(a) Applicants for a PPL(A) shall have completed at least 45 hours of flight instruction in aeroplanes or TMGs, 5 of which may have been completed in an FSTD, including at least:
(1) 25 hours of dual flight instruction; and
(2) 10 hours of supervised solo flight time, including at least 5 hours of solo cross-country flight time with at least 1 cross-country flight of at least 270 km (150 NM), during which full stop landings at 2 aerodromes different from the aerodrome of departure shall be made.
Hence your SEP training (if gained after Apr 2012...)
will now count towards a PPL with TMG Class Rating.
(Thanks, Andy!).