The false widow spider: What does it look like, where is it found and how likely is it to bite?

The venom of the noble false widow spider very similar to the venom of “true” black widow

Irish scientists have discovered that one of the nation’s most common spiders can deliver a venomous bite which can cause debilitating pain and land victims in hospital. But what do these spiders look like, where are they found and how likely are they to bite?

What are they?