Supermarket own-label premium ranges are often more unhealthy than basic ranges, Which? has claimed.

A survey by the consumer association on 54 ready meals at Asda, Morrisons, Sainsbury's and Tesco, found many premium products contained more salt, fat and sugar than basic products.

It highlighted a Morrisons beef lasagne from its 'The Best' range, which had twice the fat per portion of its budget version.