First thing is not to panic, Most Hedgehogs are sturdy only very sick ones need extra special care.
Find a box with tall sides and place some fleeces or hay in the bottom. Place the hedgehog in the box, its really important to keep the hedgehog warm so fill a plastic bottle with warm water and wrap a towel round the bottle. Place the bottle in the box with the hedgehog. Its ok to offer the hedgehog water to drink but please don’t offer food. Call us or your nearest rescue for help.
The British Hedgehog Preservation Society can tell you where your nearest hedgehog rescue centre will be, you can call them on 01584 890801