Do you have a reference for that?
LAA Website says:
Q Where can I do the course?
A At any flying club which is a Declared or Approved Training Organisation under EASA rules (DOT or ATO)
Q Who can instruct me for the NPPL(SSEA), and are there any special NPPL instructors?
A Any EASA Flight Instructor with SEP privileges can conduct your training, and, no, there are no special NPPL instructors.
No mention of UK aerodromes!
The UK post Brexit regulations states:
EASA Part-FCL/BFCL/SFCL Examiners who hold an examiner certificate issued by an EASA member state will be able to continue to undertake Skill Tests, Proficiency Checks and/or Assessments of Competence, for the period of its validity up to a maximum of two years.
The NPPL is not valid for the holder to act as PIC outside the UK except:
ANO Schedule 8 Chapter 3 Para 1(b)
(b) with the permission of the competent authority for the airspace in which the aircraft is
being flown, to fly such a SSEA, microlight aeroplane or SLMG outside the United Kingdom;