I have decided to make a complaint here

http://www.lorol.co.uk/contact-us.html

The same station assistant did the same thing last night. He deliberately stood outside with his mates instead of watching the barriers and another young man jumped the barriers.

I have also directed the company to this forum to see other customer experiences and views.

Their official line seemed to be if an assistant feels he/she is threatened he/she won't intervene. I think if they are actually standing there people would be less likely to 'try it on'.