Noisey taps
When we run the hot water tap to fill the bath, we get a knocking / rattling sound and the hot water tap in the kitchen starts to run
Advice from 2 local tradespeople
Sounds very strange that a different tap would all of a sudden turn on. Would need pipe tracking to investigate.
Usually the knocking is a bouncing washer in the tap, this can reverb the whole pipe, it's easily sorted as a rule