Service Voters’ Registration Period Order 2010

Why is it important to have them as close to the election as possible for a parliamentary election but not for a European election, an Assembly election in Wales, an election for the Scottish Parliament or any other election? It is just this election that has the 11-day scale. Why is it more important for that than for other elections? I might be making a mistake with the timetable for one or two of them, but I know that local government and other elections have much longer to be nominated—another week. Why for one? Is that really a reason not to change that timetable?