Hyder Consulting has warned that its UK results are likely to be below expectations in the year to 30 March 2013.
The design and engineering consultancy reported a strong group performance in the first half of its financial year.
But in an update to the City ahead of its six-month results announcement on 21 November, the company said conditions in the UK had been challenging.
The statement said: “The Asia Pacific region will be ahead of plan and Australia has again performed strongly, benefiting from the award of better than anticipated performance bonuses.
“This has been partially offset by contract delays and investments in China, where we expect to incur a small loss in the first half.”
It added: “UK market conditions continue to be challenging, particularly in the highways sector, and results for the year are likely to be below our initial expectations.”