At a slight tangent, not being specific to LTMA 2012, what are peoples thoughts on selecting 7700 if they were to be intercepted. It is as far as I am aware the correct procedure to follow, but I am unaware of anyone who has done it or would do it, they would rather avoid it and persist in trying to get in touch with SOMEONE, albeit 121.5 or some nearby local field if outside the coverage of a radar controller. (Low-ish level Irish sea/Scotland springs to mind).