Fish prices are at a record high up 24 per cent year-on-year, while soft drinks prices were 11 per cent higher in May 2018 than the same time the previous year, according to the CGA Prestige Foodservice Price Index.

Inflation in soft drinks has been triggered by the introduction of the sugar tax and the shortage of CO2, while fish prices are being pushed up by spiralling salmon prices and uncertainty over future fishing quotas.

"Our new Foodservice Price Index report is a reminder that inflation in the industry remains unpredictable," said Fiona Speakman, CGA client director of Food.

"While some areas of food and drink have seen some welcome price stability in recent months, other categories are vulnerable to supply shocks. For all businesses, it is crucial to properly understand inflation trends and adapt purchasing and pricing strategies accordingly."

The new report also suggests that operators should be wary of future rises in meat prices, due to rising tariffs in key territories and supply problems in Brazil, which is the world's biggest poultry exporter.

The CGA Prestige Foodservice Price Index is jointly produced by Prestige Purchasing and CGA, using data drawn from over 50 per cent of the foodservice market and around 7.8 million transactions per month.