Bollards, Marty.
There may be signs, but taking photos in defiance of them is worth a warning to desist at the absolute most.
If the concern was the taking of photos in defiance of a sign prohibiting them, then it is in absolutely no way, shape or form a police matter. For the police to attend the security guard must have suggested that a crime had been, or might be about to be, committed. For the police to continue questioning the man for 20-25 minutes as he says they did, they must have had some reasonable suspicion also.
Yet here we are three days later and there is no clarity whatsoever on exactly what Braehead thinks Chris White was up to, other than the disastrous press statement they issued this morning claiming that (despite their blanket photo ban) they don't mind *innocent* families taking pictures. Spot the disgraceful smear implicit in that remark.
Here's two of my children, photographed by me in Build-a-Bear Workshop at Braehead in 2010. Someone want to phone the polis?