And Rule 66 states that you should only ride in single file on narrow roads.
It’s called manners, something which 90% of the population seem to be sadly lacking these days.
If the choice is between “manners” and my safety then I’ll choose my safety every time. Sorry if that seems selfish.
If riding single file means that cars can get by us safely (e.g. where the lane is wide enough for a car and a bike and clearance) then yeah, obviously I’ll ride single file. That is good manners – plus I’d rather not have an irate driver behind me.
But Rule 66 is wrong. It is daft to suggest a blanket rule that you should always move into single file on all narrow roads, or whenever a car is behind you, regardless of road hazards and conditions. The overriding golden rule, especially for vulnerable road users, should be “Avoid doing anything that makes a situation more dangerous”
Plus as others have pointed out, if a motorist intends to pass you safely, in accordance with the Highway Code, then moving into single file makes his role much harder – how is that good manners?