Yep, did lots of that. At least 30 miles of it in fact.  If there is a gap, I will go through the gap in order to ease congestion and get home faster, thus running my 70mpg engine for less time and leaving the ice caps solid.    Got soaked on the way back in the rain which was nice. Also spent about an hour on the M56 shouting at people for doing 65mph in the outside lane and not moving out the way.