- All Royal Mail / GPO post boxes were painted BS 538 Post Office Red between 1874 and 1969. With the introduction of the K8 Telephone kiosk in 1969, a new "red" colour was adopted for GPO street furniture, designated BS 539 Post Haste Red. After British Telecom and Royal Mail were split by the British Government, BT continued to use BS539 exclusively, whilst Royal Mail use both BS538 and BS539 in a seemingly random way. Prior to 1859 there was no standard colour although there is a document in the BPMA archive indicating that optionally, the lettering and Royal cypher could be picked out in white or black. In 1859, a bronze green colour became standard until 1874. It took ten years for every box to be repainted during this period).
- In 2012 UK post boxes mostly in the hometowns of Team GB gold medal winners in the 2012 Summer Olympics were painted gold.