Why are some post boxes in Britain not coloured with red paint?

PETER WILSON WAS born in the English county of Dorset in 1968. In the 2012 Olympic Games, he won a gold medal in a shooting event.

To celebrate Britons who won gold medals in the 2012 Olympic Games and Summer Paralympics, the Post Office painted several letter boxes with gold-coloured paint. It was originally planned to be a temporary measure, but as the public gave it much approval, the boxes have remained gold,

Peter Wilson’s Olympic achievement is celebrated by a gold letter box that stands in Sherborne, in Dorset. It can be found on Cheap Street. A plaque attached to it is there to remind people why the letter box is gold rather than the usual red.