@Thetalesoftipan is this a fair summary of how it started, obtained by looking at the link you posted, and other websites where you are mentioned by name:
Your client triggered Napit for reasons unclear and Napit investigated an
allegation that you left circuits energised after completing minor works without testing or issuing certification.
You told the client and Napit that you had carried out tests but further testing was required to complete the certificate.
A week later Napit's compliance panel meets and decides it's still not tested and certified and suspends you.
You think that Napit should have taken into consideration that you were trying to get access to complete the tests, and they shouldn't have been black/white about it when deciding "it's still not tested" after what they deem to be an untimely duration.
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If this all started with lack of MWC's then words fail me. Surely "LIM" on certificate or results you didn't have and a covering letter would have avoided all of this drama.
I'm also staggered that you as a ~27 year old sole trader considers that trying to demonstrate that Napit isn't meeting their UKAS obligations is a good use of your time and effort.
(Finally next time an organisation is investigating you I'd suggest you consider being civil to them and avoid inflammatory comments e.g. calling them 'completely negligent'.)