A part from sensationalist bullshit in the Daily Mail, there has never been a report of then causing serious harm. The worse case scenario would be you have a very very rare allergy to their venom. Remember that up to 12 people die a year to wasp or bee stings. This has never reportedly happened with these spiders.
On the other hand, they are great at pest control and would happily live in the corner of your shed keeping all the other pests out of the way.
There is no need to kill them and they can be useful.
Edit. I need to get round to putting some up online. Maybe with a giant centipede, but we will have to see about that.