Hi Leon,
Sorry to hear about your deceased hog. 🙁 The blood coming from the mouth sounds like a worry, could it have been poisoned? Hedgehog Street have a page all about what to do if you find a dead hedgehog. In order to help find out what is behind their decline, it is important to send any dead hedgehogs for autopsy, the details are at the bottom of the page.
https://www.hedgehogstreet.org/is-disease-a-factor-in-the-decline-of-britains-hedgehogs-2/
The authorities won’t act on the use of toxic slug pellets and other chemicals unless they have definitive proof from autopsies that they are poisoning hedgehogs, I know it’s not a pleasent task, but all the necessary equipment will be supplied for you to post the remains at no cost.
Like you say, I would keep a close eye on the rest of them and only intervene when necessary. Hope the others are all ok, keep us posted…
