Although not many ATOs yet have the approval to teach for it, the LAPL has been available in the UK since 2012. Is Spain introducing it late/later?
Since you say you have only recently completed your FI Rating, then you must recently have been taught what Privileges you were training for, or at least where to look them up???
To answer your specific question - Privilege (a), see below.
FCL.905.FI FI — Privileges and conditions
The privileges of an FI are to conduct flight instruction for the issue, revalidation or renewal of:
(a) a PPL, SPL, BPL and LAPL in the appropriate aircraft category;
(b) class and type ratings for single-pilot, single-engine aircraft, except for .......