British shoppers faced increased pressure on their budgets last month after grocery price inflation edged higher, industry data showed on Tuesday.

Prices at supermarkets increased 2% in the four weeks to Sept. 29, its data showed Tuesday. The fastest increases were in chilled drinks and chocolate confectionery, Kantar said, indicating that record high cocoa prices from poor harvests in West Africa are starting to feed through.

Grocery price inflation rose in September, with average supermarket prices now 2% more expensive than a year ago, figures show.

U.K. grocery inflation ticked up slightly after August’s fall, according to the latest report from research firm Kantar. Annual grocery inflation increased to 2% for the four weeks to Sept. 29, up from 1.