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 community, civil parish and also previous royal burgh in Ross as well as Cromarty, in the Highland area of Scotland. In the 2001 census, it had a population of 719. Cromarty is a sea port on the southern coast of the mouth of Cromarty Firth, 5 miles (8 km) seaward from Invergordon on the contrary shore. Till 1890, it was the county town of the previous county of Cromartyshire. Cromarty gives its name to one of the sea areas of the British Shipping Forecast.