Telegraph: The FTSE 250 firm is a leading service provider to companies which extract oil from Western Canada's tar sands, one of the world's largest crude oil deposits, where disputes over export routes has led to widespread project delays. Wood Group said its business in Western Canada, which represents about 5pc of revenues for its dominant engineering division, has "remained subdued, as expected", in a trading update issued on Friday. Shares in Wood Group tumbled 9pc in August after the company warned...