If red postboxes didn't already look lovely enough on the streets of London, they certainly do now thanks to one mystery artist.

Royal Mail boxes have been snapped wearing woollen covers decorated in hand-knitted designs. 

The creations have been snapped in areas spanning across London, from Eltham and Twickenham all the way to Ruislip.

But the identity of the artist creating these colourful 'hats' remains a mystery.

A picture of one of the designs on Gerda Road, in Eltham, showed a knitted nest with a mother and baby birds inside, surrounded by flowers and colourful letters to spell 'joy'.

Londoners rushed to share their love for the "beautiful", "amazing" and "simply fabulous" covers, but the details about who made them are still a bit woolly...

"Well done who ever you are," one comment said.

A postbox which was given one of the "hats" in Twickenham had a message to go with it.

It said: "In these difficult times I hope that my creation makes you smile and brightens your day".

It then linked to a huge social media group where people share 'Random Acts of Crochet Kindness' but did not reveal anymore about the mystery maker.

Fans of the Postbox covers are searching for the artist to find out if they can donate money to them for the cost of the wool.

Any many simply wanted to say thank you, "for putting a smile on everybody’s face" as one Londoner said.

Ian Cuthbert, who shared the image on social media, believes it is a woman who has created the covers, but knows little other than that. "I will look out for her, someone must know her," he added.

"It's lovely," Ian told MyLondon, "she's put a smile on a lot of people's faces when people are really down with this Covid-19.

"Well done to the lady who is doing the postboxes, fantastic."