Pesticides & Slug Pellets
Pesticides used to eliminate unwanted bugs or other creatures in your garden can actually kill hedgehogs when they eat the insects as part of their diet. It is better to put the pesticides away and encourage hedgehogs into your garden, as they will eat the bugs for you anyway. They are know as 'The Gardener's Friend' for a reason!
Clear away any litter or debris in the garden that may cause harm to hedgehogs or other wildlife.
Keep all netting (including plant netting, football and tennis nets) at least one foot off the ground, so that hedgehogs can pass safely underneath.
Strimming & Mowing
Check long grass and overgrown areas for hedgehogs before strimming and mowing, as this could mutilate hedgehogs.
Ponds, Holes & Drains
Although they are good swimmers, hedgehogs can get trapped in ponds or holes with steep sides, so you should leave a submerged rock or ramp to help them climb out. Cover any holes and drains to prevent them from getting stuck.
Ideally, re-siting any materials from the bonfire is the best solution. If this is not possible, lift the materials with a broom handle (not a fork) and shine a light underneath to check for wildlife.
Leave holes in the fence line so that hedgehogs can pass in between gardens.
Sometimes hedgehogs like to nest in these, so be very careful when turning the heap - a garden fork can kill a hedgehog when thrusted into a compost heap.
Avoid shutting sheds or enclosed areas that have been open for long periods of times - check them first for any signs of wildlife.
If your dog has been known to attack hedgehogs, warn the hedgehogs that you are letting your dog out each night by turning on the outside light one minute beforehand, for example. Hedgehogs like routine and they will visit your garden at certain times - it might be wise to avoid letting your dog out at these times, or keep your dog on a lead for the last toilet stop of the night.