CCTV is not and never will be what we expect of it. That is until programmers can write software that can "see" or predict criminal behaviour and the cameras are good enough to be able to actually recognose the person it's pointed at.
With regards your job SK, the fact that a DS is dealing with it is good, plus the fact that the three water faries all saw it and will give statements to verify your story. It'll drag on, guarenteed, but if CPS decide to charge the bloke, I would expect a guilty plea on first appearence in front of the beak.
Stick with it, don't be fobbed off and keep phoning. Cops hate nothing more than getting mithered and will sort it out faster to stop you nagging!
See, insider info! You just can't beat it.
Pete