Despite signs the market was regaining confidence after the worldwide banking bailout announced on Monday, the FTSE and other major stock markets dropped again in early trading.
The FTSE 100 was down 2.8 per cent to 4,267 points at lunchtime.
The FTSE 350 Construction and Materials index was down 3.5 per cent to 2,860 and the FTSE 350 Support Services index fell 2.8 per cent to 2,686.
Both falls in the construction sector eroded roughly half the gains the two indexes had made since the beginning of the week.
Despite falls all across the industry Morgan Sindall, was up 1.12 per cent at 498.5 pence this lunchtime.