The FTSE 250 was up 1% following early losses of around 4% at opening.
The market is now awaiting the opening of the markets on Wall Street, as a public holiday postponed trading yesterday, when Asian shares registered large falls.
In early trading, Atkins recovered early losses to remain unchanged, while Scott Wilson had fallen 7.5% on early trading but had not recovered. WSP had fallen more than 2%.
Balfour Beatty, Alfred McAlpine, Serco and Carillion were up between 1-2%. Arriva had recouped early losses and Drax group was unchanged.
Galliford Try had gained 5%, Travis Perkins more than 3%.