I get similar, or sometimes worse, almost daily, especially at a fuel station I pass on my commute where people often just pull out. To be honest I don't mind within reason if I have to slow a bit if someone pulls out a bit cheekily and then GETS GOING, those that just roll out and take 30-40 seconds to get anywhere close to road speed, or pull out and then creep across if going the other way, do my head in though, especially when they then get funny about the fact you got close behind them which only happened purely due to them pulling out!
Personally in that situation I'd have eased off let the silver car go and probably slowed a little to accommodate the potential for the learner pulling out - but I find you need to mix driving decisively enough to put people off from doing silly stuff like that but also defensively enough you can react to people doing silly things
On another note, been another nasty accident on the dual-carriageway I use to get to work, the driving on there constantly does my head in, but I wonder how many people will have to be seriously injured or killed before something is done to update the layout which hasn't been changed to accommodate the difference in usage since it was built 50+ years ago and make in my opinion some common sense changes to the speed limits, etc. (Not sure details only people who've commented only saw it in the distance but seemed to think a lorry pulled out on a car causing them to clip it and then the car rolled several times into a field).