What actually moves the price
Four things affect what a job costs: the fault itself, how easy the area is to access, whether parts are needed, and timing. A tap washer costs less than tracing a hidden leak behind tiled walls. A ground-floor stopcock is quicker to reach than one behind a bath panel in a top-floor conversion.
None of that is unique to us, and we're not going to pretend a single number covers every property in London. What we control is being clear about which of those factors apply to your job before you agree to anything.
