I was doing about 10 MPH, not fast, and defo not reckless! Would the advice have been to 'undertake' on the left? Does this mean BC's filtering advice is misguided? Or should we cycle in the on-coming lane until traffic forces us to filter in?
I was trained in 'Cycling Proficiency' at school - keep to the left as is consistent with safety - and never had an accident before now. Only when I went against my ingrained instincts and followed recent advice do I now find myself damaged!
Keeping left isn't necessarily consistent with safety. There have been a number of cyclists on here who have been hit in exactly the same way as you were, except that they were filtering through on the inside and were hit by an oncoming driver turning right across their path.
No matter whether you're on the near side or the offside, filtering always requires great caution, IMO. Equally, turning across and through standing traffic also requires a lot of caution, and drivers should easily be able to anticipate filtering traffic.
Lastly, please don't call them accidents as that is a loaded word and can be offensive to victims of someone's bad driving. Here's a good writeup on why from the road safety organisation headed up by the amazing Cynthia Barlow:
http://www.roadpeace.org/campaigns/crash/