The royal cypher GR apparently represents both George V (reigned from 6th May 1910 to 20th January 1936) and George VI (reigned from 11th December 1936 to 6th February 1952).
GR, Ellenbrook Lane, Hatfield, taken on pylon hunt 1, 06/08/2022.
Edward VII, reigned 22nd January 1901 to 6th May 1910.
EVIIR, Streatley, Bedfordshire, taken on pylon hunt 24, 28/10/2023.
The EIIR post box in Lower Sundon, Bedfordshire (just north of Luton) is the only one that is always decorated when I pass it on pylon hunts. See also Where to find post box toppers in the UK.
3rd September 2022
Bees and a beehive. Taken on pylon hunt 5.
17th September 2022
In honour of the late Queen Elizabeth II, who had passed away nine days earlier. Taken on pylon hunt 7.
28th October 2023
Ghosts for Halloween, spelling out “BOO”, with a pumpkin behind them. Had I realised what the letters were for at the time, I would have straighted up the middle letter “O”! Taken on pylon hunt 24.
Baby pillar box, East Common, Harpenden, 10/07/2021, Coronavirus walk 66.