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.
Halkirk
Halkirk is a town on the River Thurso in Caithness, in the Highland council area of Scotland. From Halkirk the B874 road runs towards Thurso in the north and towards Georgemas in the east. The village is within the parish of Halkirk, and is claimed by residents to be Scotland's very first planned village.