EddieHeli.
There are actually no revalidation requirements for a LAPL(H), and there is no Certificate of Revalidation in the license. There is a rolling recency requirement as stated below.
"Within the 12 months prior to your intended flight you must have completed on the specific helicopter type.
(a) at least 6 hours of flight time as PIC, including at least 6 take-offs and landings; and
(b) refresher training of at least 1 hour of total flight time with an instructor."