In reply to Fiend: No, I did see the debates. Breaking into the E grades is always a big thing for a climber so they like to talk about it. There is quite a range over E1, though of course there's also a great deal of subjectivity about it (e.g. The Vice is almost E2 according to PGE). But the range across E2 is also significant. Insanity, Billy Whizz, Cave Eliminate; these routes are well above Pot Black, Wuthering and Soyuz. In fact I'd downgrade the latter two routes to E1.
Mind you, E3 looks pretty compact in the PGE graded list. Maybe we need to stretch that a bit, thus reducing the variation within the E1 & E2 grades.
There's a project for you