Asda sales fall as customers switch to supermarket rivals – as it happened

Asda, Britain's third biggest supermarket group, has posted a 5.3% decline in underlying sales in the three months to the end of June

With volatility high, global markets are settling into a yo-yo pattern" as volatility remains high, says Matt Britzman, senior equity analyst at Hargreaves Lansdown:

Markets may have simmered down but this roller-coaster week isn't over yet. UK markets opened lower in a move that unwinds a good chunk of yesterday's gains.

Corporate earnings are starting to slow but there's plenty for traders to get their teeth into.