Marissa Mayer has promised "not to screw up" Tumblr, the lively blogging site the Yahoo chief executive bought for $1.1bn, as the New York start-up's young founder told its nervous community: �We're not turning purple.

The benchmark index of leading shares advanced 32.57 points to close at 6,755.63 on Monday, its highest since September 2000, as global markets continued to power upwards.

Apple on Monday sought to pre-empt accusations of tax avoidance from an influential US Senate committee, publishing its written submission to the committee the day before Tim Cook, chief executive, was due to testify.

David Cameron failed to raise Google's tax affairs when he met the company's chairman Eric Schmidt in Downing Street yesterday, it has emerged.

Shares in FirstGroup plunged 30 per cent on Monday as investors balked at a �615m rights issue and the scrapping of its dividend.

High inflation has cost the economy �10billion over the last three years, according to Ernst & Young. The accountants warn households face spiralling energy and food bills and rail fares.

The FTSE 100 has closed at its highest level for nearly 13 years, finishing 32 points up on the day at 6,756. That leaves it just short of the FTSE's all-time highest finish - the level of 6,930 reached in December 1999.

Ryanair wants to more than double its share of the European short-haul market to 20 per cent in the next five years. The target was revealed as the budget carrier brushed off higher fuel costs to post a record annual profit of �569 million.

Two-thirds of British families will holiday in the UK this summer amid a cost of living squeeze that means a foreign holiday is a luxury that will have to be sacrificed.

To the uninitiated, there may not seem to be much difference between a salmon reared in Loch Fyne or the Hebrides. Yet, J Sainsbury was on Monday forced to apologise for mixing up the two areas of western Scotland in a labelling error that highlights ...