The LAPL syllabus does not include any Instrument flying therefore (a) (2) applies:
FCL.810 Night rating
(a) Aeroplanes, TMGs, airships.
(1) If the privileges of an LAPL or a PPL for aeroplanes, TMGs or airships are to be exercised in VFR conditions at night, applicants shall have completed a training course at an ATO. The course shall comprise:
(i) theoretical knowledge instruction;
(ii) at least 5 hours of flight time in the appropriate aircraft category at night, including at least 3 hours of dual instruction, including at least 1 hour of cross-country navigation with at least one dual cross-country flight of at least 50 km and 5 solo take-offs and 5 solo full-stop landings.
(2) Before completing the training at night, LAPL holders shall have completed the basic instrument flight training required for the issue of the PPL.