My understanding is that the long rods are called "double handers" and they come in a variety of actions, "Spey" being one of them. Juro does an excellent job of describing the Spey rod essence.
Other double handers, the fast tapers, are designed to throw shooting heads, and fly-shops are now calling these "Euro-actions" (Spey not being in the Euro community, I guess).
Somehow all double handers have come to be referred to as Spey rods, and this is leading to all sorts of confusion.
Happy New Year