Thanks for the news that flashing LED's now legal. I still maintain that permanently lit LED's show up better than the flashing ones. At the end of the day there is after all more light energy getting in the drivers eyes, it has to help.
Perhaps my bias is because when driving we see so many useless dim rear flashing LED's on bikes.
I recon that if a car driver thinks I'm a cyclist (because he sees a flashing light), he would be more likely to approach fast and cut me up than if he thinks I might be a motorbike or a car with a rear light out. Hence I use the brightest rear LED's I can lay hands on and choose to use them always solid on.