Pest Control Direct offer a small range of rat baiting boxes. The rat poison to use in these is a matter of personal preference, you can find poisons and traps by clicking on "Rodents & Vertebrates" in the left hand column. Some professional pest controllers use whole wheat rat bait, others cut wheat rat bait and some prefer rodenticidal blocks. In any event, the safest way to protect rat poison is to locate it in purpose made rat bait boxes. Spacing when setting out Rat Bait Boxes depends on the level of rat infestation, usually, one rat baiting station every 5-10 metres around the rat infested area would be plenty.