Undertaking / filtering on left?

I don't exactly have nightmares about it... but i get get pretty fucked-off when cyclists ride up the inside.

If I'm 1m from the curb that's because that's how much space I want to ride into when an oncoming taxi swerves at me/van pulls out etc... i'm not saving it for another cyclist so we can have a fucking chat!

Yeah this annoys me as well. i have to look over my right shoulder for advancing cyclists more than I have to look over my left shoulder for advancing traffic.

edit: other way round. left-right knowledge fail. ;(