By Laura McGuire WH Smith said it was “confident” of another year of significant growth, as it continues to benefit from a resilient demand for travel. In an update this morning, the popular newsagent posted an eight per cent rise in group revenues for the 20 week period to January. Brits travelling on trains and hitting airports helped hike revenues by 15 per cent when compared to the same period last year. The firm said it plans to open 15 more sites across airports and train stations, adding to its 580 sites in these locations. However, WH Smith’s high street locations showed signs of strug…