PPL
Yes your right. The 12 hours must be in the last 12 months of the two years. This must include 1 hour with an instructor (P/UT) and i think a minimum of 6 take off and landings.
You then must get that signed up within the expiry time. If not signed or you do not do the 12 hours. You can renew the SEP class rating by a skills test with an examiner . If you let it lapse for more than 5 years its a full PPL skill test.
I am pretty sure the above is accurate but look in LASORS or the CAA website.
jtk