European telecoms provider Colt Group reported a marginal rise in full-year earnings as revenue grew for the first time in seven years. The company, which runs fibre optic networks and data centres for large and mid-sized companies, said adjusted earnings before interest, tax, depreciation and amortisation rose to €333.6m (£287.4m), from €332m a year earlier. Colt, which also offers audio and web conferencing and cloud services, said revenue increased 2.6 per cent to €1.59bn. Revenue fell 1.9 per cent in 2011. Revenue from the voice services division increased one per cent,having declined by between eight and 12 per cent annually in the previous four years.