No, its your Single Engine Piston rating that will expire.
F1.4 RE-VALIDATION OF SINGLE-ENGINE
PISTON – SEP (LAND) OR TMG CLASS
RATINGS
Revalidation by Proficiency Check
A SEP (Land) and/or TMG rating may be revalidated by
passing a Proficiency Check (LPC) with a JAR
authorised Flight Examiner (FE(A)) or Class Rating
Examiner (CRE(A)). If completed within the three
months preceding the expiry date of the rating(s), no
loss of rating validity will be incurred - the new rating
expiry date will be calculated from the preceding rating
expiry date, not from the date of the Proficiency Check,
or,
Revalidation by flying experience
A SEP (Land) and/or TMG class rating can be
revalidated by flying experience by producing logbook
evidence to an appropriately authorised JAR-FCL
Examiner, before the rating expiry date has passed, of
the following flying experience completed within the 12
months preceding the rating expiry date
12 hours of flight time in SEP or TMG aircraft as
appropriate to include;
i. 6 hours as pilot-in-command;
ii. 12 take-offs and landings;
iii. a training flight of at least 1 hour’s duration with
a FI(A) or CRI(A)* who must countersign the
appropriate logbook entry (see full details below).
*The instructor must be authorised in accordance with
JAR-FCL to instruct for the JAR-FCL TMG or
SEP(Land) rating as appropriate. UK QSP only may
undertake the instructional flight with a UK Military
instructor.