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.
Llangefni
Llangefni is the county town of Anglesey in Wales and includes the principal offices of the Isle of Anglesey County Council. UK Census 2011 recorded Llangefni's population as 5,116 individuals, making it the 2nd biggest settlement on the island. The town is near the centre of Anglesey, and gets on the River Cefni, after which it is called. Its destinations include the Oriel Ynys Môn gallery, which details the background of Anglesey and houses the legacy collection of Charles Tunnicliffe. In the west of the town is a big high school, Ysgol Gyfun Llangefni (Llangefni Comprehensive School), as well as in the north a Victorian parish church, St Cyngar's, embeded in a woody waterfront location called the Dingle. The community was formerly named Llangyngar, Welsh for "St Cyngar's church".