The trouble with Sam's Trains reviews is that he usually knows virtually nothing about the actual prototypes of the models he is reviewing. All he does is make initial comments on appearance, and how well it's put together (or not), and then a performance test.
He criticised the fact he couldn't access the motor of the Heljan 1361, but if he's so good at repairs (as has been said), he should have found his way in to access it (easy when you start looking).
He doesn't know what many of the details are (especially on steam engines), so obviously doesn't know if they are correct or in the right place, nor does he compare models with known measurements. In many cases he doesn't even know if the liveries are correct. If he were to review the Kernow 1361, would he comment on the splashers or cab footstep positions? (Yes, Heljan got those bits right, but not all the handrail variations - but he didn't comment on that because he doesn't know). When there are two models of an identical prototype on the market, like the 1361 class, he ought to at least review and compare them at the same time.
Watching his last review, he was enthusing about picking up loads of identical 1970s-quality Hornby wagons for £4 each! Woopeedoo!