UK consumers are likely to find online grocery shopping a disappointing experience, a new survey has suggested.

The survey, carried out by food retail magazine The Grocer, found glitches with most of the five big UK supermarkets' online shopping services.

The most frequently encountered problems were difficulties logging on, late deliveries, and wrong orders.

Waitrose and Tesco's sites came top of the league table, while Asda's was ranked last after researchers made six abortive attempts to log on.

In other glitches, J Sainsbury's delivered an order worth five times more than the Grocer's team had ordered.

The Grocer also reported that Iceland's delivery team refused to hand over alcohol to the teenage daughter of one of its researchers.