A mum has been forced to have her house fumigated after she found one of the world's deadliest spiders - in a bunch of bananas. 

The woman bought the bunch from her local Lidl but was horrified when she opened the bag and found the poisonous Brazilian wandering spider inside. 

There was also a giant nest in-between the bananas with dozens of smaller spiders emerging from an egg sack. 

The mum enlisted in the help of Nuneaton and Warwickshire Wildlife Sanctuary boss Geoff Grewcock, 66, who rushed over to her home. 

Mr Grewcock believes the Brazilian wandering spider had travelled an astonishing 5,246 miles (8,443km) from Colombia with the bunch of bananas. 

The arachnid is known for building webbed nests on the fruit and are the most venomous arachnid on the planet according to the Guinness World Records. 

Mr Grewcock said: "I don't like spiders but I go along because something needs to be done. 

"I get called out a lot for spiders, especially black widows in packets of grapes, and in a lot of cases some of them are very small so I was shocked when she pulled out this one. 

"She was a bit puzzled, she opened the bananas in the bag and the spider fell out onto the floor. 

"It's all scrunched up and it's just a bit bigger than a 50p but if it was alive and opened up I think it would be double the size." 

Mr Grewcock has now sent off photos of the spider and the egg sack for the species to be verified. 

He added: "There were some young things in there too and they were put in the freezer to kill them, they would be poisonous. 

"If you have a dangerous spider in your house you want it out of there straight away. 

"If you find anything like that put it straight in the freezer, you cannot have these things running around in your house, you cannot mess about, you've got to put that danger out of your house. 

"It's just bad luck really but when you are buying food really examine it, if it's in a container have a really good look before you buy it. 

"It's very common, last year I had seven black widows in grapes, it's scary sometimes." 

The terrified mum is now due to have her home fumigated following the incident. 

A spokeswoman for Lidl said: "We have thorough procedures in place to ensure that the fresh fruit and vegetables available in our stores are of the highest possible quality for our customers. 

"We are therefore very sorry to hear that these standards were not met on this occasion. 

"The matter will be fully investigated by our quality assurance team." 

The Brazilian wandering spider has been classed as the world's most venomous arachnid in Guinness World Records since 2010. 

In 2005, a British man spent a week in hospital after he was bitten by one of the spiders that had travelled to the country in a shipment of bananas. 

The spiders get their name because they are known to wander the jungle floor at night, rather than residing in a lair or maintaining a web. 

During the day they hide inside termite mounds, under fallen logs and rocks, and in banana plants. 

Although the Brazilian wandering spider venom is the most toxic - with death occurring within two hours of a bite - an effective anti-venom is available and few fatalities occur. 

Its venom is currently being studied for use in erectile dysfunction treatments after it was found that a bite from one of the spiders can give male victims a painful four-hour erection. 

Caroline Bagshaw, 29, was shopping at the Lidl branch last Wednesday when her young son Jayson picked up the 89p bunch of children's fun-size bananas. 

The mum-of-two said she briefly checked the fruit before putting it in her trolley at the store in Nuneaton, Warks. 

But she was horrified when spotted the spiders as she was making packed lunches for five-year-old Jayson and his brother Joshua, two, on Thursday morning. 

Caroline has now been forced to shell out £150 to fumigate her house and is trying to get the money back from Lidl. 

The supporter worker, who lives with her partner Adrian Cook, 29, a Japanese knotweed technician, in Nuneaton, said: "I went to the shop last Wednesday with the boys and they can be a bit of a nightmare when you take them food shopping during the school holidays. 

"They just want to pick everything up so I let them choose two healthy snacks. 

"Jayson picked up a bunch of kid's fun-size bananas and I quickly checked them to see if they were mouldy, as you do. 

"It wasn't until the next day when I was making packed lunches for the boys that I pulled off two of the bananas from the rest of the bunch and a spider fell out. 

"I didn't scream because I didn't want the boys to get scared. 

"I was horrified. I looked in the bag and saw odd white bits and I just threw them straight in the bin as anyone would. 

"I got a piece of cardboard and scooped the spider into a Tupperware container. 

"Luckily it was dead, but my main concern was the fact that it had been in my house for over 24 hours. 

"I squirted bleach everywhere and chucked all my food away. 

"I called Lidl and they asked for a batch number but there was no way I was reaching into the bin to touch that bunch of bananas again. 

"When you see a spider and white bits, you don't exactly stop and take photographs of it. 

"I said I would go back to the shop and get the batch number from another bunch, but they said it would be a different one as it was the next day. 

"I explained I wanted my house fumigated as I was concerned for the safety of my boys. 

"I called Geoff as Lidl said they needed proof of the spider's species in order for me to be reimbursed for the £150 cost of fumigating my house. 

"He came to my house and almost instantly said he was pretty sure it was a Brazilian wandering spider. 

"Geoff sent Lidl photos and I've had to constantly call them to follow it up but they don't seem to be interested. 

"They've been useless and haven't given me any updates. 

"I shop at the Nuneaton branch every week but I'm not going back there now. 

"The bananas weren't so fun-sized in the end."