Please do not take wild boar home.
It may seem the best option at the time, and it is hard to walk away, but from experience we know this is no longer the best option for the chances of the wild boar to survive long term.
The reasons to leave them alone, against all-natural reactions to want to help, are:
You can see there are many issues with rescuing wild boar; whilst we would love to open a wild boar rescue for exactly the reasons above, so we can help, unless anyone has a spare £100k this is a little way off, maybe one day.
The only realistic option, and best chance for the wild boar is to leave them alone. Yes, some may naturally die, but if taken captive they will often only be euthanised, but with the added stress of days of captivity.
If you find one genuinely injured, and safe to do so a vet will euthanise, otherwise you need to call the Forestry England team, (https://www.forestryengland.uk/our-offices), who have rangers trained in dealing with scared injured wild boar humanely.
If the wild boar is on the road, call 999, for your safety, road user safety, and quickest help for the injured animal, and read more here -> On the Road.