Does whatever form they provide fully describe what work was done and what circuits were affected ?
Is the level of testing done adequate to cover the work. so we can be sure its safe, or at least as safe as what it replaces ?

If further calcs are required e.g. cable ratings - if for example breaker rating increased  - is enough  info provided ?

If yes, obligations are met.  The fact that it is all presented on one 'standard form' or 'model form' or another may be a convenience, but unless contractually stipulated not a requirement.

Mike

The change was in accordance with an approved design. The only question is, really, Because the circuit protective device has changed, is an MWC the appropriate certificate, or should it have been an EIC? 

We have had quite a discussion about it on site with varying opinions and viewpoints, and one of the chaps has talked about should there be a fault/accident/incident occur sometime in the future and the paperwork be thoroughly examined, will the fact that its an MWC be found to be inadequate? Below is a quote from 7671 Page 514, and the thought is, does the circuit breaker come under 'similar items' ?

The Minor Electrical Installation Works Certificate is intended to be used for additions and alterations to an installation that do not extend to the provision of a new circuit. Examples include the addition of socket-outlets or lighting points to an existing circuit, the relocation of a light switch etc. This Certificate may also be used for the replacement of equipment such as accessories or luminaires, but not for the replacement of distribution boards or similar items. Appropriate inspection and testing, however, should always be carried out irrespective of the extent of the work undertaken.

Another intersting point from

BS 7671:2018+A2:2022
MODEL FORMS FOR CERTIFICATION AND REPORTING

is

From the sections above I read this as the person/company doing the work could be more liable in a court of law should something happen.  It is also worth mentioning that when you request work you could ask for the EIC to be issued and not a Minor Electrical Installation Works Certificate (MEIWC).   Personally I think that an EIC should be issued. 

Another intersting point from

BS 7671:2018+A2:2022
MODEL FORMS FOR CERTIFICATION AND REPORTING

is

From the sections above I read this as the person/company doing the work could be more liable in a court of law should something happen.  It is also worth mentioning that when you request work you could ask for the EIC to be issued and not a Minor Electrical Installation Works Certificate (MEIWC).   Personally I think that an EIC should be issued.