Would you hand over your name, phone number and address to a stranger online? Probably not. But you've likely ordered a meal from a food delivery app.

Privacy concerns have now been raised in the UK after a woman received multiple, unsolicited messages from a driver after ordering food via the Just Eat app — an app owned by the same company that runs Menulog in Australia.

Michelle Midwinter said after her meal was delivered, she received a WhatsApp message saying 'Hy' from a number she didn't recognise.

"I asked who it was and the person revealed they had just delivered my food," she said.

"At first I was shocked at the fact someone would approach me in that way, but that turned to feeling very uncomfortable as I realised this guy had my name, address, and phone number."

Photos she shared on social media showed the man later messaged "goodnight bby (baby)" and sent her a kiss emoji.

"If you have a bf (boyfriend) tell me. I don't want to make any problems," he said.

Authorities investigating possible breach of privacy

Ms Midwinter made a complaint to Just Eat and was offered a five pound ($8) voucher in return for the "inconvenience".

Michelle Midwinter said Just Eat phoned her directly to discuss what they were going to do about her complaint. ( Twitter: Michelle Midwinter )

But after pressing them again — saying it wasn't an "inconvenience" but "disgusting behaviour" — the company raised their offer to 10 pounds ($17).

Later, Just Eat UK said on Twitter that the driver's actions did not represent the company's core values, and it would investigate the case.

"We're looking at our procedures to understand why incorrect and inappropriate information was given out on this time," it said.

The UK Information Commissioner's Office (ICO) also said it would look into the matter, saying it could be a breach of the Data Protection Act.

"Organisations have a legal duty to make sure personal data is only used for the purposes for which it was obtained," ICO said.

Ms Midwinter said she did not go directly to the restaurant as she was worried about the repercussions.

"I did not want them to find out who made the complaint — after all, my privacy had already been breached by them and how was I to know they would not tell the driver it was me who filed the complaint?" she said.

"This guy has my name, address, and phone number, and if he ended up getting fired over this, who knows what he would do with my information?"

Women share stories of similar encounters

Ms Midwinter said "countless" women had reached out to her since she shared her experience on social media.

"I am astounded by the amount of females who have contacted me saying a similar thing happened to them," she said.

"This is no longer about my personal experience, this is about privacy law and safeguarding females.

"This is clearly a huge problem and it needs to stop."

Menulog says on its website that it takes privacy "very seriously".

"Our high-tech security system ensures that your card details aren't shared with anyone else including the restaurant," it says.

There is no mention of customers' phone numbers.