2009-03-20 - Rider Down, Uxbridge Road + Askew Road

I got taken out today in hyde park of all places,
which i was respond with how is it my fault if you crash into me from behind?

It sounds like he was going too fast and not paying enough attention. If you had looked behind, you might have been able to make a signal or wobble a bit to catch his attention.
Did you get his name and details and report it to the police? I don't know what the rules are in a park but on public roads you are meant to report any crash where there have been injuries. When a guy died in a similar bike on bike crash in 2007 no one reported it to the police.