My LAPL shows SEP (Land) under Ratings, certificates and privileges.
Under Certificate of Revalidation it shows the Date of Rating Test and Valid Until, signed off by the Examiner.
The validity of an LAPL obtained through an NPPL paper exercise matches that of the NPPL. So when you are due for an hour with an instructor to revalidate the NPPL, you take that opportunity to get the LAPL revalidated at the same time.
I keep my NPPL current, just in case ...