UK has its dangerous species too. Not a lot, but they do exist.
In boring, grey, temperate UK, the most dangerous creature you're likely to run into is a dairy cow or red deer – neither of which actively seek to do people harm – so such a response to a spider here would naturally be mocked.
AFAIK adders are NOT extinct yet. Though their bite is usually not fatal and you have to live somewhere really out in the sticks to run into one.
There are also a set of lovely, protected creatures called bats. If you think that you will live long after an untreated bat bite you are up for a rare treat (pun intended). It's called rabies and while the land-walking mammal population in UK is rabies free, the bat's aren't and there have been a number of fatalities over the years.
Biting the hand that feeds IT
