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Is 'showrooming' killing the high street?

Many shoppers admit to "showrooming" a phenomenon whereby consumers visit shops to see and test products, before going online for a better price, and buying elsewhere.

Research by design agency Foolproof found that 24% of people showroomed while Christmas shopping - and 40% of them took their business elsewhere.

According to researchers at market research company TNS, one third of consumers around the world admit to this retail tactic.

Amy Cashman is Head of Technology at TNS UK and spoke to the BBC's Aaron Heslehurst.