Despite an 11% decrease in sales, Danone-owned yogurt brand Activia held on to second place, according to Mintel.
The brand recorded sales of £237m ($367m) for the period - down from £265m ($410m). Despite falling sales, Activia still controls 11% of the market in terms of sales.
"Activia has been a key focus for the company in terms of innovation," said the Mintel report.
"However, in the 12 months to April 2013, value sales of the Activia brand tumbled by 11% to £237m. The flavour extensions of both its Activia brand and its Activia Intensely Creamy line aim to drive consumer interest in the brand and combat flagging sales."