Ian H
Ancient randonneur
[can of worms opened] What is called an audax in the UK is really a randonnée allure libre. Your actual audax event is ridden in teams, each with a captain, and at a set pace. Audax Club Parisien used to run audax events but fell out with Henri Desgrange who withdrew permission to run events under his rules. ACP then formulated their allure libre rules but retained the club name. Audax UK was founded in imitation of ACP and that's where the confusion started.That sounds like ... er ... an audax (with possible arguments about what is meant by "set route". Are there audaxes that aren't BRM?
So, in France and elsewhere, lots of clubs organise randonnées without reference to ACP. AUK's BR and BP events are in effect similar, being not recognised by ACP.