In the dead of night, crafty folk, with nicknames including the Caped Crocheter and the Crochet Guerrilla, have been creeping out of their homes to put colourful woolly hats on pillar boxes.

One of Kate's most memorable hats has to be the blue, pillar box style she stepped out in back ... She added a matching pillbox hat adorned with an oversized bow by Sean Barrett once again ...