This will depend on the issue. However, many plumbers are also Gas Safe Registered, meaning they can undertake work on all aspects of boilers and central heating systems. It's best to look out for plumbers that display the badge of your boiler on their literature.
Glenfinnan
Glenfinnan is a district in Lochaber location of the Highlands of Scotland. In 1745 the Jacobite increasing began here when Prince Charles Edward Stuart ("Bonnie Prince Charlie") raised his requirement on the coasts of Loch Shiel. Seventy years later on, the 18 m (60 ft) Glenfinnan Monument, at the head of the loch, was erected to memorialize the historic occasion.