Britain's biggest supermarkets, including Tesco (TSCDY) , Sainsbury's (JSAIY)  and Walmart's (WMT)  U.K. unit Asda, are all suffering from sales declines amid a sharp rise in food price inflation and increasing competition from low-cost rivals.

Walmart's U.K. unit was the worst hit, with sales falling 1.8% to £4.07 million ($5.05 million) over the 12 weeks ending March 26, according to data published Tuesday by Kantar Worldpanel.

The FTSE 350 Food & Drug Retailers Index was down slightly in Tuesday morning trading. It has lost 3.73% over the past year.

 A late Easter weekend also factored into a drop in sales.

READ MORE: Walmart Feels Bite From Rising U.K. Inflation

More from Video

Economist Perspective: Can U.S. Dollar Keep Its Momentum in 2019?

Economist Perspective: Can U.S. Dollar Keep Its Momentum in 2019?

What Investors Should Know Ahead of Google's Hearing on Capitol Hill

What Investors Should Know Ahead of Google's Hearing on Capitol Hill

Abbott Downing Exec: 'There's a Missed Perception That Volatility Means Risk'

Abbott Downing Exec: 'There's a Missed Perception That Volatility Means Risk'

Jim Cramer to Elon Musk: 'No Lawyer in the World Would Say You Should Do This'

Jim Cramer to Elon Musk: 'No Lawyer in the World Would Say You Should Do This'

Abbott Downing Executive on New Years Resolutions for Investors

Abbott Downing Executive on New Years Resolutions for Investors