But as I write I'm not thinking of myself as to the riders who were behind me. OK, there were not that many, but in I believe they are the most audacious riders on the event, and we should be helping them, not pulling up the drawbridge on them.
Very laudable, but the line has to be drawn somewhere. For those who would argue that "I can only just finish in 40:00 therefore the regs should help me by allowing the BR limit of 41:40" (taking your BCM example), I'm sure we can equally find those who will say "I can only just finish in 41:40 therefore the regs should help me by mandating a 14.3kph speed (43:30)", and "I can only just finish in 43:30 therefore..." ad infinitum.
The whole idea of audax is to meet a challenge at a defined standard. So there has to be a line. Therefore there will always be those who are close to or just over the line, wherever the line happens to be drawn. Using this argument as justification for moving the line the only logical conclusion is to do away with the line altogether.
But if it were, and to expand on my previous post, my proposal would be for all AUK events to run at BR standard (whether 15 or 14.3kmhr, an Org decision), with BRM Validation offered to riders achieving the BRM standard (call it a Gold Medal finishing time, if you will).
I suspect this could be progressed without amendment to AUK regulation (IANAL).
Read that again and you'll find that it's proposing exactly the current situation but worded in reverse (i.e. "meet a higher standard and you get an extra validation", rather than the current "don't meet the standard but meet a slightly lower one and we'll give you a consolation prize").
If we are to have multiple standard events (which is in itself a fine idea) then the rider has to decide beforehand which they want to opt for. So they have to choose BR or BRM on entering. If they choose a BR 600 but finish inside 40:00 then they still only get a BR validated ride. Likewise if they opt for BRM but finish outside of 40:00 then they get nothing. YPYMATYC
And as you say, I don't think doing this requires a change in the regs - it can be done already (granted the IT systems could be improved to make things easier for everyone if we want this to become the de facto standard rather than simply being down to the individual organiser). The only need to change the regulations would be to mandate in the regulations that the organiser must offer the choice (increasing choice for the rider but reducing it for the organiser).
I'll also note that the validation figures for the past few years show that there have only been a
very small number of riders who have required this bail-out clause and been BR validated on a BRM event.