The article says the “carboniferous” period. There were at that time giant dragonflies and (my favorite) the giant sea scorpion. Also (according to the article) the british isles were much closer to the equator.
“The animal can be seen to have only existed in places that were once located at the Equator, such as Great Britain during the Carboniferous. Previous reconstructions have suggested that the animal lived in coal swamps, but this specimen showed Arthropleura preferred open woodland habitats near the coast.”
Giant millipedes. Galloping through the open woodlands.
Not sure my 300 winny would take it out.