I just had to do a rather long journey by motorway, used to do a LOT of driving but since moving rurally the motorway stuff has dropped by about 90%. Today on a very fast moving section of the M4 I pulled out of the inside lane to go round a caravan and then noticed the traffic ahead was very disjointed, lots of brake lights, the lovely free flowing traffic was looking quite sketchy in places. Then it became apparent there was a slow moving vehicle in the middle lane, I was up to it quite quickly as doing 70mph and they were doing around 55mph in the middle lane. The inside lane was completely free, the outside lane was full of the people who like to do minimum 70+++ and then people trying to go round the slow car by pulling into the outside lane but it was busy. It was actually scary because people weren't matching the speed of the 80mph people before trying to pull round the slow guy. I stayed behind him as I was there then, matching his speed and the outside lane was flying past, also because people were coming up behind me at 70 and having to adjust to the drop in speed. It was a little scary so I tentatively flashed at him to see if he noticed the inside lane was free, then gave a little 'bip' of my horn in case someone was lost in an audio book and had forgotten the need to manoeuvre on a motorway (not a big blare aggressive horn, just a quick one). Nothing changed so I moved down a gear and waited until I had space and time to get up to speed and go round. By this point people were undertaking the guy as well, like water flowing round a rock in a stream.
I feel bad now for flashing and going 'bip' at him now though, don't want to seem like an aggressive driver, I was just concerned for the state of the motorway and hoping he'd be all 'ah, oops, back in the inside lane for me'. What is the best way to behave in this situation?