Asda sales have slipped lower in the three months to September after it said political uncertainty hit consumer spending.
The UK supermarket chain reported a 0.5% decline in like-for-like sales to September 30, as it dipped from 0.5% growth in the previous quarter.
It said that "customers concerns over Brexit" weighed on the results but hailed "strong" online grocery sales for the period.
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Roger Burnley, Asda chief executive officer and president, said: "This quarter has afforded consumers little respite from political or economic uncertainty and this has shown in their spending.
"However, we have remained focused on doing the right things for our customers.
"We continue to work hard to keep prices low for our customers as well as driving quality and improving our shopping experience.
National Lottery operator Camelot has reported record half-year results, boosted by sales for the £170 million EuroMillions prize won by a single UK player last month.
Both ticket sales and returns to good causes have risen, according to half-yearly results for the National Lottery, but Camelot would not discuss profits in the same time period.
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The figures show that, in the first six months of the 2019/20 financial year - between April 1 and September 29 - ticket sales rose by 13.5% to £3.9 billion while returns to good causes increased by 10.5% to £876.8 million, £83.6 million more than the same period last year.
Prizes to players increased by 13.4% - a total of £2.2 billion, and £265.3 million more than last year, Camelot said.
A spokeswoman for Camelot said: "Although we don't publish profit at the half-year, our profit after tax is less than 1% of total revenue, with 95% of sales going to winners and society."
Card Factory's latest trading update revealed a tough third quarter across its stores, hit by falling numbers of shoppers on the high street.
Like-for-like sales dropped 0.4% across its 1,010-strong shop estate in the UK and Ireland over the three months to October 31.
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Online sales growth also slowed against a strong performance a year earlier, but remained the bright spot, at 16.2% in the quarter.
This compares with 25% online growth in the first half.
Shares in the firm fell more than 4%.
Overall revenues rose 5% in the nine months of the year so far as it pushed ahead with a store opening programme, launching another 12 new stores on a net basis in the third quarter.
Karen Hubbard, chief executive of Card Factory, said the group remained "broadly" on track with full-year expectations as it heads into its key festive trading period.
"I am absolutely committed to securing the future of our business for the benefit of our colleagues, our customers and our communities - whatever external challenges we may face."
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