So...take 2! The full bust adjustment seems to have worked but now a few things don't align properly and the collar needs changing! Aahhh!!! Needed to alter a few of the key pieces to re-test the collar sections, which in take 3, seemed to work :) The zip is now better integrated as it wasn't fastening properly and is now included within a seam.
Ok, happy now...time to create facing and lining patterns.