The little fellow that modeled for this illustration would be too small to make it through the winter, he was actually curled up in the palm of a hand during a summer visit to an animal sanctuary, (now you know all my secrets). They do need to have reached a good weight before they have built up enough reserves to see them through the winter.
I have found a very good website with lots of helpful advice about hedgehog protection, it is owned by The British Hedgehog Preservation Society.The site has easy to follow instructions for creating housing for hedgehogs which would provide shelter during the winter months.
Now I own a dog I have become very aware of the effect of fireworks on animals, in fact Ted is reduced to a quivering wreck when he hears a bang. I loved bonfire night when I was a child but I do wish that we could limit our use of fireworks to maybe one week in November. It seems to be the fashion nowadays to have them all year round which makes it difficult for animal owners.