Depending on road conditions, traffic volume etc. If I'm in the slow lane and car ahead is faffing about in the middle, quite clearly not going to move then I undertake sometimes. So many cretins sit in the middle lane dawdling along with zero intention of moving into the slow lane. Its just how it is.
Does anyone else ?
Yep, often. Not swinging across two or three lanes of traffic to pass someone who should be in Lane 1.