A “Party Time" birthday banner bought from retailer B&M went viral after it was misspelled and celebrated “Pimty Tare" instead.

Fran Taylor, who writes parenting blog Whinge Whinge Wine, found the mistake when preparing for her son's fourth birthday.

She wrote on her Facebook page:

“That's right, it's Pimty Tare in this house."

“Thanks for nothing B&M Stores, you big pile of useless cheap shite."

“At least he's only four tomorrow so he won't f****** realize."

Fran, from Tonbridge in Kent, England said she had been drinking Pimm's tea in the sunshine and refused to spend time re-threading the banner.

The birthday banner was bought by Fran TaylorFran Taylor/PA

Here's the banner in it's full glory.

Whinge Whinge Wine/Facebook

She wrote:

“To the humorless bastards pointing out that one could rethread it … No. Shan't. And you're not invited to my pimty."

She shared her tale on Twitter as well.

But Fran teamed up with a fellow blogger to offer the viral banner after seeing the humor in it.

Fellow blogger Man Behaving Dadly created his own Pimty Tare banners.Man Behaving Dadly/Facebook

However, B&M quickly got in touch to apologize for the mistake.

The company said:

"First of all, we hope your son has a brilliant 4th birthday pimty – they grow up too quickly!"

"Secondly, thanks for letting us know about this. We're sorry to see this – not sure how it's happened, so we'll look into it for you!"

“We know it's too late for you, but your sacrifice may allow us to save others … it's a noble deed."

The store chain offered to send out a gift to make up for the error, before signing off:

“Thanks, the big pile of useless cheap shite, B&M."

Fran, who has been running her blog for more than three years, said:

"That was nice given it wasn't really a complaint as such. It just made us laugh."

"We are definitely keeping the banner – it's a new family tradition."