I better ask an electrician to come and inspect and certify the work then...
Entirely unrealistic, and not likely to happen.
The concept is that the person installing it does the inspection as it's being installed - to ensure that among other things cables are not damaged, wires are properly connected, light fittings are secured to the wall, manufacturer's instructions are followed, and so on.
Once the installation is fully installed, and before it's connected to the supply, certain tests are done and the results recorded on a certificate. Such as those to confirm that the CPC (earth wire) is connected at each point, the resistance between conductors is high enough (low would indicate damage or moisture), and items such as switches are properly connected.
It's then connected to the supply and some other tests are done to confirm that RCDs are working as intended, loop impedance is what would be expected, etc.
Those are also added to the certificate. It's generally useful to then confirm that things like lights do actually work as intended.
Doing all of the above without inspection or testing and then calling someone to do it for you is entirely futile - they can only inspect what is visible, and would have to dismantle most of it to examine anything concealed such as inside light fittings, cables that are in ceilings, inside walls, under floors and anywhere else.
Some tests can be done - but most tests need to be done before it's connected to the supply to avoid danger. Some of them should be done before anything is installed, to confirm the existing supply or circuit is suitable.
I will disconnect the new lights from the circuit and wait for an electrician to inspect... is that reasonable? Or should I just take it all out?
Too late.
The reality is that although all electrical installation work should be inspected and tested by those installing it, DIY work never is and never will be.