How many ways of doing things can you think of that are peculiar to the UK and not found in any other countries as far as you know?
Here's one to start you off: having a door-mounted letter box so that as soon as an item of mail or a leaflet or circular is delivered, you can pick it up without having to leave your house or flat.
AFAIK in most other countries in Europe and elsewhere the norm is to have a separate external mail box, either on the wall of your house, in the entrance foyer of your apartment block, or next to the road (and I believe that in some countries, such as France and the USA, mail boxes have to be of an approved type). Some homes in the UK have an external mail box instead of a door-mounted one, though.
Here's one to start you off: having a door-mounted letter box so that as soon as an item of mail or a leaflet or circular is delivered, you can pick it up without having to leave your house or flat.
AFAIK in most other countries in Europe and elsewhere the norm is to have a separate external mail box, either on the wall of your house, in the entrance foyer of your apartment block, or next to the road (and I believe that in some countries, such as France and the USA, mail boxes have to be of an approved type). Some homes in the UK have an external mail box instead of a door-mounted one, though.