The Thames Flying Squad

After the Boat Race the Thames River Police, technically the Marine Police Unit (MPU), turned their RIB's nose downriver and opened up the throttles.

The results were rather spectacular: I'm not sure what the official line is on power boats racing on the Thames but its said that all you need for a race are two boats heading in the same direction and in this case there were three of them.

I don't know which one won, but I'm guessing their colour would be black.