My view is if you can't drop someone then you can't moan about them wheelsucking. A small flick of the elbow is sufficient to indicate that they should do some work, if they don't then you can be safe in the knowledge that they either aren't strong enough to overtake you or are one of those terrible nouveau cyclists who haven't learned manners or etiquette yet so deserve your pity and mild derision.
My view is if you can't drop someone then you can't moan about them wheelsucking. A small flick of the elbow is sufficient to indicate that they should do some work, if they don't then you can be safe in the knowledge that they either aren't strong enough to overtake you or are one of those terrible nouveau cyclists who haven't learned manners or etiquette yet so deserve your pity and mild derision.