Driving in town 2 lanes in one direction, suddenly car next started changing the lane without any turning light, I had to press a horn and brake and almost avoided him but he still was moving towards me and inevitably clipped passenger side wing and... kept going. No witnesses, I mean there were few cars around but no one cared. On next traffic light I went out to check the wing, it's nothing major just a bit of a paint of other car left and some not significant scratches. Most of it probably will go off after polishing, but not all.
I made a picture of other car reg. But now thinking that this is lose-lose situation for me. If I report it, I have to deal with insurance and most probably increase on the next one and also excess -250. If I won't report it won't cost me anything I just will be left with damage and

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What would you do?