How to stay legal
Your LAPL(A) is a lifetime licence that contains SEP(land) and/or TMG privileges restricted to non-complex EASA aeroplanes with a maximum take off mass of 2 metric tonnes and a maximum of four people on board.
You can fly more complex aeroplanes within the privileges if you have 'differences training' signed off in your log book by a suitable instructor. The LAPL is also valid on non-EASA UK registered aircraft in the UK.
The LAPL requires an in-date EASA Part-Med Medical Certificate, at LAPL level, but Class One or Class Two certificates can also be used. A valid JAA Class One or Two medical certificate is also acceptable. But you cannot use your LAPL with an NPPL medical declaration.
The SEP(land) or TMG endorsement on this type of licence is not issued as a rating. So there is no rating expiry date. Instead you must follow self-validity checks on your own flying history for the past 2 years to ensure currency on the day of your planned flight.
To be able to fly you must have completed, in the two years before any intended flight, a total of 12 hours as pilot in command of an aircraft covered by your LAPL(A) privileges in addition to 1 hour of refresher training with a flight or class training instructor.
If you haven't completed these 13 hours in the last two years, you must rectify the situation before flying again under your own privileges.
If you are merely lacking the hour of training with an instructor in the past 2 years, you are allowed to complete that task to restore your own personal validity (assuming you still have 12 hours pilot in command time in the previous 2 years by the time you wish to fly again).
If you lack some of the pilot in command hours in the previous 2 years, you can either opt to complete a proficiency check, and take a flight test with a flight examiner, or you can build your solo hours as though you were flying as a student pilot in command. To do this, you'll need to contact an ATO and be signed out for solo unaccompanied pilot in command flights by a qualified instructor within the ATO. In practice this may require some dual flights before the instructor and ATO is willing to authorise the flight to start building your pilot-in-command hours. Once you have built sufficient hours in the previous 2 years to satisfy the LAPL validity rules, you can once again fly under your own privileges.