Building control and the architect should inspect the works along with other interested party's eg the Fire Service, throughout the project in order to sign it off and agreements should have been made clear during construction. You should then do a premises inspection to identify any thing you are not happy with SBH

This reminds me of a NEBOSH question from some years ago. My answer was consult with a surveyor or an architect. As the previous post said a simple visual inspection won't necessarily tell you much. PS I got the NEBOSH question wrong, they wanted the H&S professional do a basic visual inspection; just shows you what NEBOSH knows.

Don't forget electrical certification to "prove" that the install meets the requirements of BS7671, thus likely EAWR89, provided by a competent "organisation", there is the design aspect, which also must comply with CDM requirements, the installation which should comply with BS7671, and the inspection & test, again BS7671, but this is the section which confirms the install meets the requirements of the standard, and is completed in accordance with the design specification, so someone must compare the finished works with the original specification/design.