The FTSE 100 fell into negative territory in early trading today as jittery investors await details of today's emergency Budget.
As of 10.30 UK time, London's leading index was down 1.35%, or 71 points, to 5,227 with commodity stocks and banks losing ground.
Miners also suffered, with Fresnillo down 3.5%, Kazakhmys falling 3.16% and BG Group down 2.98%.
Barclays is down 3.06% while Lloyds Banking Group and RBS are also lower.
Leisure group Whitbread, up 2.71%, is top of the leaderboard after posting a strong performance from its Premier Inn hotel chain. British Airways, up 0.33%, also made gains after agreeing a recovery plan for its ballooning pension deficit.
Chancellor George Osborne is expected to unveil a raft of tax rises and spending cuts in what he says will be a "tough but fair" Budget as the Government looks to tackle the country's deficit.
To promote 'long-term investment'
Switching 'hard and expensive'
Smaller funds still packing a punch
To drive progress