Jesus christ what next.
I like the idea of two companies or even a company and an overriding trust owning a company
What are you planning to crash into? Other than when taxiing, it's very hard to do 3rd party damage accidentally and then even harder without killing the pilot. With a body in the wreckage, they will find the aircraft owner soon enough. Confidentiality is irrelevant; if you want protection from another pilot causing an uninsured loss then a single limited company should do it. Shareholders are not normally liable for anything.
there have been many bankrupt flying schools over the years that have miraculously risen from the ashes as an illustration of how effective the use of company in aircraft ownership can be
Not really. Aviation just has a lot more crooks and conmen in it than most forms of business. In GA training you can defraud a number of PPL students for £5000 each. You can do it totally above board, but there is no need to keep the money, because you won't need it. It won't be there anyway because you used it all up to pay the rent, and your salary. The planes were never owned by the school (of course). No other assets are required for flight training.
The company/trust structure might get you around these rules.
Not until the nearest AOC holder reports you to the CAA and they will be around right away. Which will take under an hour - the speed of rumour around the average airfield is about 150kt. CAA absolutely loves going after alleged AOC breaches. They get good fees from AOC holders.
This kind of "rent to a school" scheme is best forgotten, for all the reasons already listed in this thread.