Now that ITV have altered their schudules so that there are no soaps on a Sunday evening, Emmerdale is on for an hour on a Tuesday. I think it is only this hour long episode that is given a title, not the normal half hour ones the rest of the week.
I would imagine it's because they're trying to make more of it - perhaps they think if they give it a title and make it sound like more of a drama they will stop some of the people who will turn over half way through to BBC1 to watch Eastenders!