we did away with any rights of privacy when the anti terrorism laws was enacted in the uk, until then you could refuse a search asking "what act of parliament gives you the right to search me at this hour (providing it daylight) without due cause?"
a smartass cop just would just make sumat up like a burglary round the corner, or car theft etc.
you can of course be a pain in the arse by wishing to be taken to the station and been searched in front of a solicitor of your choice, give them some extra paperwork to fill in, and waste some time- its quite funny when they find fukall on you!!
if your prone to been searched because your ethnically challenged

always go to the police station if they stop n search you to often and find nothing and you have the search paperwork you may have a valid claim for compensation for discrimination/ harassment!
fukn pigs