The grocery market is expanding at record rates, the latest data from TNS Worldpanel has revealed, with the UK's top three supermarkets increasing their market share.

The overall market has expanded by 6%, with the top three supermarket chains posting strong growth and lifting their combined share by 1.5% in the 12-weeks to 22 April.

Tesco, the market leader, increased its share by 0.6% to 31.4%. Asda's share was up of 0.5% to 16.8% while Sainsbury's share grew 0.4% to 16.4%.

Morrisons market share fell 0.1% to 11.1% against the same period last year. Waitrose's market share is up 0.1% to 3.9%, TNS revealed.

At the discount end of the market, Kwik Save's share has fell 1% to 0.2% while Aldi's market share was up 0.1% to 2.5% and Lidl's share dropped 0.1% to 2.2%.

TNS director of research Edward Garner commented: "From now on, these levels of growth are going to prove challenging to maintain as the sharp decline of the Kwik Save business begins to drop out of the annual comparisons. Aldi and Lidl will have to strive to keep up their current strong run as the one-off gain of shoppers and shops from Kwik Save becomes history."