Taking photos without consent at work's Christmas party

I've just had my grievance result today from a complaint I made about a colleague and I’m pretty sure legally I don’t have much help on the topic but I wonder if employment law could help?

Basically at a work Christmas party a consultant took several ’secret’ photos of me without my consent, I ignored what he was doing and felt uncomfortable but got on with the evening. However, I have since learned he was taking photos down my top. My workplace say that what he did was wrong but won’t act on it and he will continue to work alongside me. Is there anything I can do to prevent this? I feel as it’s a photo of an area that is covered this surely can’t be ok!?

Sorry for my rambling message, this whole thing has shaken me up quite a bit and any advice would be very helpful.