Hedgehogs may become locally scarce or even disappear, but nationwide extinction is unlikely. Nevertheless, hedgehogs appear to be in decline. The total population is unknown. Hedgehogs survive well in gardens, particularly assisted by food put out for them. This should be encouraged because modern tidy gardens may not otherwise provide sufficient food.
Gardens are also hazardous.
Hedgehogs hibernate under garden bonfire heaps. These should always be turned over before being burnt. Hedgehogs swim well but easily drown in smooth-sided garden ponds, being unable to escape from them. Garden netting is also dangerous unless staked down tightly to avoid hedgehogs becoming entangled. Probably yes, because of habitat loss.