Far from rationalising the system the European Parliament elections will become more irrational with a single constituency. Everyone will find it very odd that they can potentially vote for parties from the other side of the continent that they have never heard of. It may make the system the same everywhere but this does not mean it is a sensible system for European elections. The number of parties makes it complex, as does the concept of an international parliament where all votes go into one central pool rather than being based on nationality.