Mott MacDonald also has operations in Pakistan, but no British workers are involved. It is working on six residential towers in Dubai Marina.
Richard Moult, the firm's Middle East regional director, said: "We would obviously like to continue working in the area." However, he added: "Everyone's feeling nervous about this, and the Americans are understandably jittery."
Ian Mensa, Middle East project manager for Mouchel Consultancy, was also worried, as a number of workers were imprisoned during the Gulf conflict. He said: "We have instructed all our staff to be sensible in their behaviour."
Mensa added that, recently, large contracts had started to come through again in the region as confidence returned after the stabilisation of oil prices. "But now there is a big question mark hanging over some proposed projects," he said.
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British firms sit tight in Middle East