Supply is made possible by state-of-the-art lighting that allows growers to emulate summer daylight hours.
Product manager Barbara Bray said: “Last year we produced the first ever commercially viable British winter tomato crops, which generated sales of £1.5m over the winter season.
“Everything we grew last year we sold. Despite the premiums, customers still wanted British.”
This year, English Village Salads will focus on Asda’s Extra Special line, Sweet Plum.