Bloody millions of them.
As far as I can remember estimates go from 300 ish to 3 times that depending on which side of the story you want.
Problems occur when they moot up the verges, which is a bit unsightly, picnic spots which is a bit more so I suppose and gardens and sports pitchs. Fences have to be darn strong to stop a really determined piggy.
Some people have been pursued by them. Probably cross mummy piggies. The odd dog has been duffed up quite badly.
They are potentially worrying at night as they are nearly black once grown. Their tendency to moot on verges whilst sticking their arses into the roads can be terminal for boar and car. They are solid! The thought of hitting one on a motorcycle doesn’t bear thinking about, they don’t fold up like deer.
I have had some near misses on the bikes, especially on the gravel when traveling at speed. Also riding through a posse of little ones ( Humbugs) in poor light is worrying as the just mill around and you just know that mum is near by.
I think they are great. You can spend ages watching them, it really screws up a fast ride. Just avoid getting too close to little ones and I like to have a climbable tree close if I am getting close to them. They can’t half shift if they want. I spooked one and it reminded me f those big offshore power boats as it took off. The arse went down and it was gone. Watched one bounce off a wire fence and then on its second attempt it went right through it!
Just creep around quietly watching where you go.