Eddie and Bernice Kozlowski from Nottinghamshire both developed swelling and sore itchy lumps after being bitten by a venomous spider - despite living for nearly 20 years in Australia, and escaping all the country's creepy-crawlies.
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The pellet pierced two-year-old Pemble's right eye, causing irreparable damage to the iris.
The driver and passenger were shaken but otherwise unhurt.
The driver was parked up in a lay-by in Leicestershire when a man approached him.