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.
Cromarty
Cromarty is a town, civil parish and previous royal burgh in Ross and also Cromarty, in the Highland location of Scotland. In the 2001 census, it had a population of 719. Cromarty is a sea port on the southerly coast of the mouth of Cromarty Firth, 5 miles (8 kilometres) seaward from Invergordon on the opposite coast. Until 1890, it was the county town of the previous region of Cromartyshire. Cromarty provides its name to among the sea areas of the British Shipping Forecast.