Brits are not happy shoppers anymore - and they're telling businesses exactly what they think of them.

The annual Comparisat study looked at customer service in 36 top firms, including high street retailers, utilities providers and e-tailers.

It found one in five people are now prepared to complain about a product or service, and if they don't get satisfaction, they're likely to stop using the service or at least reduce the amount of money they spend with it.

Spokeswoman Janet Weitz said:

"Customers today expect more and if they don't get what they want, they go elsewhere. Don't companies realise how much everyone hates poorly handled complaints and off-shore 'script-driven' call centres with interminable automated menus and often unintelligible call handlers?"