You will be stationary in the picture anyway, as it is a still picture.
It all comes down to “Give Way” or “Stop” as dotted lines are “cross, if it is safe to do so” and solid lines (like the ones in the middle of the road to stop overtaking) or the ones at level crossings, mean that you should not cross them, unless otherwise directed.
It seems that you gave way rather than stopping behind the line.
Sorry mate, it is just the way that I see it, and these cameras only see the situation as “rules is rules”.
Having said that, as you are a Rover 75 bod, I might smuggle in a file inside a cake for you.