The boss of British cleaning products maker McBride (MCB.L) warned an "extraordinary" rise in the cost of raw materials such as cardboard and solvents would last for "quite some time" as the company reported an 18% fall in annual earnings on Tuesday.

The British Chambers of Commerce has warned that the preparations by its members so far only represented the “tip of the iceberg”.

Dozens of companies have cut jobs, beefed up their European operations or issued warnings on the impact of the UK's departure from the EU.

Increases of up to 63% on products across big four supermarkets, says research by the Guardian and MySupermarket.com