According to this document you should have a dan buoy flying a black flag along side the pot buoy, as a ribber I feel I would be a bit of a hypocrite if I didn't use one.
It's all finished now and it's been tested in a wheely bin and correctly weighted by the use of two thirds of an engineering brick (thanks Nos for the idea)! And it also has the recommended reflective tape on the pole
The whole thing didn't cost a thing as it was made by stuff I already had.
I have found a load of anchor rope and a much larger orange buoy from one of my old seariders, so I think we're all set
Apart from the bait that is
Although I have made a bait bag
But for future reference you can buy a complete flag from here
Although they don't post
(about half way down the page)
Coastal Nets :: commercial fishing protective clothing & chandlery