The only way to check they've done it is to have been there when they did it.
Second best way is to get the before & after report of the measurements.
The apocryphal tale is that the technician decides whether they need doing or not by simply listening to the engine. If they're very quiet then they need doing (as they're 'tight'), and if they're very noisy they need doing (as they're loose). It shouldn't be this way, but I know for a fact that it can happen, and I'd not be too concerned if they were simply upfront about it, and reduced the Inspection by £300-£400 to cover the time they didn't spend doing them.
It's best not to worry about whether they've been done or not, and to simply get them redone somewhere you trust, so that you know for certain.