The Sainsbury UK supermarket chain is testing the trolley in its branch in Cromwell Road in Kensington, West London, according to "The Telegraph" (http://macte.ch/TmpsA). It could introduce them across the UK if the trial is successful.

The trolleys come complete with a tilting iPad holder and speakers. Their front bumpers are fitted with a sensor that lets off a warning beep if an engrossed shopper gets too close to another customer. An onboard battery with a self-charging solar panel ensures that the iPads never run out of power.

The trolleys have been developed by broadcaster Sky to highlight its Sky Go service, which allows iPad users to watch live sport or news on their portable devices, says "The Telegraph." The iPads themselves are, of course, not included.