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.
Crymych
Crymych is a town of around 800 residents and a community (population 1,739) in the northeast of Pembrokeshire, Wales. It is positioned around 800 feet (240 m) over water level at the eastern end of the Preseli Mountains. It stands astride the old Tenby to Cardigan turnpike road, currently the A478. The town developed around the former Crymmych Arms railway station on the now-closed Whitland to Cardigan Railway, nicknamed Cardi Bach (Little Cardi). Crymych, which is twinned with Plomelin in Brittany, has a chosen neighborhood council. The village has actually offered its name to an electoral ward of Pembrokeshire that incorporates the towns of Crymych itself and Eglwyswrw.