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@Velocio
The law changed on flashing lights last October or November. You are permitted to have them, though I personally think blinking lights make it harder for other road users to assess speed and direction with accuracy and in a short time. The brain has to do more work to assess precisely where the intermittent blink is, and the distance and time between blinks to work out the speed and direction.
They may be legal, but I prefer to burn a bit more battery to ensure that other road users know precisely where I am and where I'm going.
Redundant in the summer months, but when Autumn and Winter comes around I won't be using flashing LED's.