Thanks again Hunt.
Out of interest, what are the advantages of exporting DV/DVC codecs as opposed to say, ProRes HQ (my normal workflow)?
The key thing at this stage is not codecs, rather I would like to avoid having to recreate over a hundred chapter points and a large number of menus with animated backgrounds. If I can achieve this by fooling Encore into relinking to .mov's of a different resolution then I'll be a happy person.