British pork facings in UK supermarkets averaged 79 per cent of the total market in 2017, down 2 per cent year on year, according to figures from AHDB.
In Asda, 44 per cent of pork on the shelves was British, a 10 point drop year on year while Lidl increased its British facings by 5 points, to 99 per cent. All other major retailers offered exclusively British pork, with the exception of Tesco.
AHDB suggested a fall in UK production this year may have led supermarkets to increase reliance on imports.
For bacon, facings fell to 45 per cent, down from 47 per cent last year.
Morrisons dropped by 7 per cent, Asda by 5 per cent and Tesco by 4 per cent. However, the Co-op reported a 12 per cent increase after making a pledge to only sell British fresh meat.
British ham was also down one percentage point to 64 per cent following declines at Morrisons, Asda and Marks and Spencer.
However, sausage facings were higher year on year at 84 per cent. Lidl increased by 11 per cent, offering 100 per cent British sausages in most surveys with only Aldi and Morrisons dropping slightly.