The reason that parents are prevented from taking photographs of their children at, say, sports day or the school concert, Neighbours is because they take place on private (or usually local council controlled) property.
The hysterical fixation that has built up in the UK surrounding paedophilia means that these organisations believe they have a duty to stop anybody taking any photographs of any children (even their own). They are, of course, entitled to impose these rules on property or at events which they control, but have no similar control in public places.
To return to your boyfriends plight, if he is charged he should engage a solicitor. If the witnesses to the incident have not been interviewed by the police they need to be asked why not. In addition, the fact that so much CCTV evidence of the event probably existed but has been destroyed by your neighbour needs also to be raised. He will no doubt say that it did not exist, but it will be for a court to decide who they believe.