Don't speak to them unless it's security or operational related. That's what I do with our pilots and strikebreaking crew and will continue to do so.
These are direct quotes from EG102 Dignity at Work - Harassment and Bullying
Examples of harassment and bullying may include:
-displaying pictures, graffiti,flags or emblems which could reasonably be considered to be offensive;
-isolation of an individual or group of individuals and non-co-operation at work or exclusion from work-related social activities;
There are others which could equally apply, these two seemed to be the most appropriate. Miss M I would caution you to think about your intended behaviour as it would be a shame to lose your job in an ill considered fit of pique. Remember that not all VCC are easily intimidated and may well be watching for the sort of bullying behaviours you have stated here that you both do now and intend to keep on doing.