The 200 (Deeside Loop) that I completed is only a BR event, can somebody explain the difference between a BR event and a BRM event and will the BR event be OK to qualify for a SR?
And to answer the question...
BR events are not validated by ACP (the French Audax club), only AUK. BRM events are validated by ACP and can be used as qualifiers.
BR events are run with slightly looser time restrictions (minimum average speed can be 14.3kph instead of 15kph, and you get extra time if the ride is over-distance unlike with BRM). For example:-
Imagine a 600 that was actually 619km. It could be:-
BR at 14.3kph min average speed: 619 / 14.3 = 43h17
BR at 15.0kph min average speed: 619 / 15.0 = 41h16
BRM: 40h (600/15)
(It's slightly more complicated than this because the distance used for timing calculations should be the 'shortest distance between controls' distance which isn't necessarily the 'routesheet' distance, although many organisers just use the routesheet distance. So a 619km Audax with 14.3kph may have a time limit of, say, 42h18 because the shortest distance between controls is 605km and 605/14.3 = 42h18.)
BRM time limits are defined as:-
200: 13h30m
300: 20h
400: 27h
600: 40h
1200: 90h (although PBP is run as a 40h 600 to Brest and a 50h 600 back to Paris).
In practice it means you get your brevet card back (after an extra delay) from a BRM event it will have a sticker from the ACP on it with a validation/homologation number. It's this number you'll enter in the PBP registration website which will form the proof that you've done the requisite early registration ride in 2010, or the SR series in 2011.