Surely an individual could de-identify the contract, both from themselves, the agency and the client. They then ask HRMC IR dept what would be their employment & tax status if offered such a contract. They could even already be on the contract, or anticipating it. It is an information seeking question in general terms. No-one is implicated and thus no-one is liable for any penalty action. The old BRK contract, as claimed here, is still in use with some, and the new one, we are told, is being enforced as the old one dies, or new-comers arrive. Surely bar-room lawyer opinion is not necessary. One individual with a version of each of any current contract would suffice to achieve an answer once and for-all. It might help stop the demise of the profession, because this type of 'employment' will be copied just as baggage, boarding & credit card charges were done in spades. Arguing round & round in circles is a waste of breath.