UK supermarkets Asda and Marks & Spencer triumphed in this year’s Decanter World Wine Awards, each picking up top accolade, 'platinum - best in show', for their value wines.

Decanter Supermarket of the Year 2015, Asda, won the platinum – best in show award for red single varietal under £15 for its La Moneda Reserva Malbec from Chile. It was available this week at Asda for £4.37 and has an RRP of £5.75.

Marks & Spencer also won a platinum – best in show for the best white blend under £15 for its Colinas Del Itata Old Vine Field Blend 2014 from Itata Valley in Chile, which retails for £10.

Both wins also reflect the strong year it was for Chilean wines across the results, with four platinum – best in show awards going to Chile.

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Marks & Spencer carried on its success from last year by winning a platinum – best in category for its Finest Reserve Port and for its Florent Rouve, Viré-Clessé Burgundy 2014 for best Chardonnay under £15.

Tesco also won a platinum – best in category for its Tesco Finest* Dessert Semillon, Riverina, New South Wales, Australia 2011 for best sweet under £15.

The Wine Society’s own label Exhibition Rioja Gran Reserva 2004 was also awarded a platinum – best in category for best Spanish varietal over £15, as well as its Exhibition Chardonnay 2014 from Auckland for best New Zealand Chardonnay under £15.

All gold medal winners go forward to compete against others in their region for a platinum medal. Platinum winners are then entered into a special blind tasting involving both Steven Spurrier and guest vice chair Gerard Basset OBE MW MS. This is when the platinum – best in show winners are chosen.