For information purposes, copied from the AUK rules:
"Brevet de Randonneurs Mondiaux (BRM) is a term registered to Audax Club Parisien (ACP),
used to describe a cycling event of 200, 300, 400, 600 or 1,000 km, controlled through a series of
time and distance checks by means of a ‘brevet card’. BRM events are registered with ACP,
appear in the Randonneur Mondiaux Calendar published by ACP and, when held in the UK, also
appear in the AUK Calendar.
Randonneur Mondiaux events (RM) are as above but are registered with Les Randonneurs
Mondiaux (LRM) and are 1,200 km or longer."
The only exception I'm aware of is PBP which, despite being 1200+ km is validated by ACP.
Andy Corless