Ok I got most of the banding reduced by about 80-90 percent, so now it is at an acceptable point at least. Thank for the posts. I got some good advice from a great guy at Film Workers in Chicago that along with knowing I would need to add noise to the AE comps worked fine. I used an adjustment layer on each comp, and applied noise at either 3, 4 or 5, depending on the shot, and unchecked color noise. Then re-rendered everything, it look MUCH better although not perfect. Next time I will insist on having a little more say on how it’s shot. Turns out it was shot on Panasonic 2000 and captured on P2 cards, so it was 8 bit from the beginning. Then the Avid (8 bit), which made me leave the project settings in AE at 8 bit. I then rendered using Animation to avoid any further compression and this made a hugh difference.
Thanks again for the responses! I’ll be back I’m sure.