I fished off Harilla Landing (Long Island) between Cow island and Long Island Friday Night. I walked towards the broads on the inside of long island and encountered a large area with standing water/slush on top of about 3" of black ice before I reached Sandy Island and the broads. It was dark and I was alone, so I was a little more careful than I would have been at other times, but I was very suprised about the lack of ice in areas where there was snow. Where the snow had melted there was 4" of snow ice and 4" of black ice, but in areas with standing snow there was only 3" of black ice.
I didn't even reach Sandy Island, so I cant speak about the Broads, but the ice was not as good as I had expected it to be given last weeks cold weather.
Good Luck