I think in the U.S. when they do the lineup of suspects for the victim to identify, they are always behind one-way glass so they can't, in turn, identify the victim. I'd think this would be the same in the U.K., but I seem to remember some recent films that depict this situation in Britain, and there was no glass. The suspects where just lined up in a room with a bunch of police and the victim, who identified them that way. Is this a strange sort of fiction, or are things truly conducted that way?
I tried Googling this, but it appears to be one of those mundane details they just don't bother to tell you about on informational websites.