A woman was left "horrified" after finding bleach sprayed on the bottom of Marlow's gold postbox.

Liz Wilks was walking down Marlow High Street on Thursday (June 16) afternoon when she noticed a "frothy white milk substance" which she was later told was bleach.

Thames Valley Police has confirmed they are investigating the incident and have asked anyone to call 101 or make a report online by quoting reference 43220263737.

Liz said: "I took my letter to the post office and handed it to the postmaster asking about substance around the base of the high street post box.

"There was a postwoman having her paperwork signed and she said it is not milk, it is bleach.

"She advised that she had sprayed it there to stop dogs peeing around it.

"I was horrified as there was not a sign on the box to say that she had sprayed it.

"I was thinking that dogs could lick it or stand on it burning their paws!"

Postboxes across the UK are repainted gold in the hometowns of every gold medal-winning Team GB Olympic and Paralympic athlete.

After a campaign for Royal Mail to turn the postbox on Marlow High Street from red to gold to honour Sir Steve Redgrave failed, it was painted gold in 2012 to celebrate Paralympian Naomi Riches’ success.

The Bucks Free Press has approached the Royal Mail for comment on the incident.