PR-03Mark your fixing points and check what's behind the wallHold the rail up level and mark each bracket's screw holes on the wall with pencil, lining up with stud centres where you can. Before you drill: cables and pipes can run almost anywhere, not just in the 'safe zones'. Use a detector, but still treat every hole as if something could be there until you've proved otherwise, because detectors miss cables that are deep, in metal conduit, or behind metal-backed board. Find your stopcock now, usually under the kitchen sink, and check it turns freely. If you have any doubt at all, isolate the circuit at the consumer unit before drilling, and be ready to shut off the water at the stopcock straight away if you hit a pipe.