Hi,
Just a quick one, I am re-reading the BBC SPec sheet as I feel I need to get to grips with it 100%, as we are about to go into shooting proper, and I still dont really know what Time Code is all about!! 
Once of the sections mentions that Electronically generated moving graphics and effects (such as rollers, DVE moves, Wipes, fades and dissloves) must be generated and added as interlaced to avoid unacceptable judder.
Ok, I get wipes, fades and dissolves, but what are rollers and DVE moves? and since we are shooting and editing in 25p, is this still neccesary?
Thanks
Pierre