Don't get me started on that qual...Its a shambles
Interested to see if I could find anything relevant to the Napit - Aviva discussions and found this on an Aviva site
As a general guide most competent electrical installation companies are registered with The National Inspection Council for Electrical Installation Contractors (NICEIC) which carries out independent checks on quality and workmanship. Membership of the Electrical Contractors Association is also a good test of compliance.
https://help.aviva.co.uk/risksolutions/safety-management/REF_HF5027
Have a look where it says general safety
If Napit cared to research their partners, they would find that they promote our competitors only