On Tue, 15 Aug 2006 22:00:23 +0100, Dave Arquati wrote:

It might make the routes easier to identify in places like Ealing, where
there are quite a lot of these E-routes; whenever you're outside Ealing,
you know that E-routes go there. That doesn't really work for some of
the others though (like C).

Not all the E-routes go to Ealing Broadway though (or even
particularly near it).