I supposed they have changed the name recently, because the brochure I had in 2006 still name the chassis as Trident, and because of that, almost all bus spotting organisations here still call the vehicle "ADL Trident/ADL Enviro 400" in their fleet lists.
To be honest though, I couldn't care less. I tend to agree with ATE24, as long as we know what we are talking about, why bother arguing anyway...!
It's not the problem. The biggest problem was the E200 was conceived in a design that basically took the London market into account only. Once it was banned in London because of its rear door, it had nowhere else to go.
That's why they got back to basic and launch the E200Dart instead.