The police can also search people without reasonable suspicion if there is a particular concern about serious violence or the carrying of weapons as long as a senior officer has authorised such searches (section 60 Criminal Justice and Public Order Act 1994).
That covers it. remember even in...
well not a copper, but the last point is the killer.....as in " I thinkin my judgement there may be a chance that there may be pobbily trouble involving said individual, (he doesnt need evidence) and in that case, please show me your ticket and id."
simples