1. That there were green Routemasters...
...as well as RTs:
2. That there is no street lighting at Theydon Bois (and they have never had it). And that it's possible to visit Essex without leaving the M25 and not even using any other transport apart from the Tube.
3. That postal bikes were an early invention:
4. What do the post boxes look like under the ground level...
...and inside:
***
(and I also have more pictures if you're by any chance interested)