Obviously the 24 stands out from the other events in many ways, especially as it is the only 'Allure Libre' event on the calendar. From that standpoint alone, it deserves to be a BRM.
I'm sorry but this is nonsense. All AUK events are 'Allure Libre' **.
The only 'audax' events which are not 'Allure Libre' are those run under the rules of the UAF - a style where everyone is kept together and at a fixed pace by a road captain, sometimes referred to as euraudax.
** For now, AUK affiliation with UAF and introduction of a few 'Allure Fixe' events is a possibility in the future.
I'm taking the French at face value, and 'Allure Libre' means 'Free Pace'. The 24 has no minimum or maximum speed, whereas all other points-bearing rides do, and are therefore not run at a free pace, simply within wide limits.
Obviously there are physical limits and the overall course for the 24 is scheduled for between 500 and 550 miles to cover the likely podium placings. But that's a recognition of what is achievable.
I like that 'inclusive' aspect of the 24, but the restriction to only members of CTT affiliated clubs excludes recumbents and some other types of machine. That revolves around insurance partly. I feel that it would be nice if there were other 'Free Pace' events. where the boldness to enter is not contained by fitting within the usual 15 to 30 kph template, and where any human-powered machine could enter.
The absence of 'Allure Fixe' events does leave a gap for those who like to conform to even tighter limits, and for those who would like to control such events. There's always a market for satisfying the needs of those who like to be bound by restrictions, often with numerous sub-clauses.
A case of 'chacun a son gout, or chacun à son goût'. One's English, and one's French, the main difference being where you place the accent. Like 'Allure Libre', which in English would seem to mean 'within broad limits, defined by a committee,' and those limits vary according to whether it's a BR or a BRM.