Bruce,
Only scope UK operators ?
Maybe the CAA obtain the services of an engineer with a borescope and expertise in analysis of the engine core ?
Then, assess the results and come to a conclusion - maybe publish the results for all to see ?
I'm no expert but it seems logical to me, purely to gain an insight of some sorts if nothing else.
I really can't see the objection to an investigation of the exposed airframes and engines in order to clear this whole sorry mess up and all being well get things flying as normal.