Good stuff as long as any CCTV is preserved buddy. Let your insurance company know its available though, then if it all goes silly you can at least complain they didn't follow it up.
It's not unusual for people to claim something entirely different happened further down the line and it sounds like the dads an arse. Independent witnesses can decide not to pit pen to paper and she only has to say the scary man in the BMW made her sign a note saying it was her fault.
Just FYI Data protection swings both ways though buddy, broadly speaking you are actually entitled to view it, obtian a copy of any data held on you, CCTV or otherwise.
See section 9.2
http://www.ico.gov.uk/for_organisati...INAL_2301.ashx
Good luck with getting it sorted, sounds like you've been entirely reasonable. They've certainly shot themselves in the foot.