Thanks for the feedback CatBus. I think you may very well be right about lowry pushing the contrast to the very limit of the highlights. I may have to reconsider my approach to ESB in terms of increasing brightness. I should probably transfer this clip and that same bit from Harmy's despecialised edition to my ps3 so I can see how the different brightness settings look on my TV.
EDIT: I'm pretty much with Harmy in terms of how the colour grading is supposed to be bluish/cyan in this scene. I'm pretty sure its meant to look that way and all the sources i've seen seem to indicate that as well.