This Belfast firm, which designs and installs underground cabling networks, has laid almost 3,000 miles of undersea fibre-optic cables between the UK and the US to create the fastest data connection yet between the two countries. Exports hit £3.3m in 2015 and M&M hopes to win more contracts for power and telecoms lines crossing the Celtic Sea to Europe. Founded in 1980 by Noel Loye, 65, the firm is run by his son, Gareth, 36.
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