Great comms, very pleasant to deal with, Anthony contacted my tenant as soon as I passed on the details and was out to diagnose the fault the next day. On diagnosing the issue rather than resorting to a straight part replacement (as an earlier plumber had suggested), Anthony reset the flow and pressure in line with the manual, which has resolved the issue for now....charging me call out rather than multiple hundreds to replace the aging heat exchange. I won't hesitate to recommend Quality Plumbing & Heating and fully expect to be using him again in future.