TOT-13Drill and refit accessoriesFor anything screwed back into the wall - a soap dish, grab rail or toilet roll holder - drill through the new tile with a tile bit first, then switch to the right bit for the wall behind. Before drilling anywhere, use a cable and pipe detector, but still expect something's there: know your stopcock (usually under the kitchen sink) so you can shut the water off fast, and if there's any doubt, isolate the circuit at the consumer unit first. Into solid brick or block, drill to the plug's stated depth and fit the correct plug and screw. Into a timber stud, drive a wood screw straight into its centre, no plug needed. Into a metal stud, use a self-drilling metal-stud fixing or a toggle-type hollow-wall anchor - a plain plastic plug or a wood screw strips straight through 0.5mm steel. Into plasterboard between studs, or through dot-and-dab into the void, use a toggle or hollow-wall anchor rated for the item's weight, or one long enough to reach the masonry behind the dab. A metal stud alone won't hold a grab rail meant to take a person's weight - fix through to a timber noggin or the masonry behind it instead.