When I was in St Richard's for over six weeks, with sepsis, a few years back there was a constant flow of people that had been bitten by these blighters, trust me it's not just a wasp sting for all, some faced far worse outcomes.
Mate of mine was stung on the forearm by one in his garden....swelled up to twice the size and ended up hospitalised. Incredibly painful. They're nasty ******s. Just google images of 'false widow spider bite'