SR-02Check for hidden pipes and cables before you drillRun a detector over your marked points, but don't trust it completely — detectors miss cables and pipes that run deep, at odd angles, or behind tiles and metal-backed board, and bathrooms often have pipework hidden near the shower or bath. Before you drill anything, find your stopcock (usually under the kitchen sink) and check it actually turns, so you can shut the water off fast if you hit a pipe. If you have any doubt about what's behind the wall, isolate the relevant circuit at the consumer unit first, and be ready to turn the water off at the stopcock the moment you cut into anything that could be carrying water.