These decorations are the work of a group of knitting and crocheting enthusiasts who call themselves "yarnbombers."
They secretly craft themed decorations for British royal weddings and jubilees and then put them out in public places under the cover of darkness.
Now, the "yarnbombers" have decorated the country's distinctive red postboxes with knitted horse-drawn coaches, crowns, Charles and Camilla dolls, Union Jack flags, and bunting to mark King Charles III's coronation on Saturday.
In the towns of Hertford and Ware, a group of knitters and crochet enthusiasts called the Secret Society of Hertford Crafters have decorated 37 postboxes for the coronation.
The group of crafters got started in 2017 at the beginning of the postbox topper trend in the UK and has since then produced decorations regularly to mark anniversaries and national events, as well as at Christmas and Easter.
The crafted decorations for King Charles's coronation have generally been a source of local pride, although in one village in southern West Sussex, a topper was stolen.
