@OogieBoogie Well mannered and brought up proper......most of SW were dragged up. Also can depend on if the asile is full of stand ups....and the driver wouldn't hear you.
@KiwiBird Interesting! I have never seen one like that.
Most of the buses, both local and long-distance, used in the UK have a single door apart from the emergency exit - and in many buses that is not a door but a window broken with a special hammer. The local services buses have a low front entrance, and this can be lowered further by a control on the suspension, close to kerb level, to help wheelchairs and push-chairs. Then the floor slopes upwards towards the back, to a step or two to a higher level above the engine and rear axle. So nowhere to put a door at the back.
It's normal at each stop to allow passengers to alight before those who had been waiting, board the bus, as there is only one door and the aisle is a bit narrow. So you pass the driver in both boarding and alighting - so re your reply to OogieBoogie, it's possible to thank him or her on your way off the bus.
This alighters-first etiquette has carried over onto travelling by train.
The long-distance coaches are bigger, higher, and do have a proper emergency door near the back, but it is on the vehicle's off-side.
@ArishMell You need to travel more. The second door is only used exiting and located just in front of the rear wheels in both single and DD buses. Much more efficient in peak periods. Talking city commuter buses not long distance.
@ArishMell our busses were different, we called them bendy busses.
The etiquette here is: if you are near the front door then thats where you alight, but if you are near the middle or at the back, then you use the side door. (The side door is purely an exit only door.)
@OogieBoogie I see! Thank you! Quite a number of European cites use those, too. We use double-deck buses in Britain to solve the same problem of trying carry as many seats as possible in one vehicle.