I think if you were ordering the Trophy you'd have a bit more bargaining power. I was ordering the SE SR and fairly obviously wasn't going to be seriously considering the new model. Also, they knew fine well that I had driven an insurance write-off to the dealership. While I did say that my bashed-up GTI was taxed and MOTed until the end of August so I was prepared to wait, it was obvious that when he said "I have a blue SE SR sitting out back waiting to be prepped, would next Monday suit you?" I was going to agree to virtually anything.
Actually the salesman did endear himself to me. He said, don't take what we'd offer you on that GTI, go back to the insurance company and tell them you've changed your mind and you'll take their full offer to scrap the car. Cry if you have to. (I had thought I couldn't afford to take their offer because I'd be left without a car, but being able to get the MG4 immediately changed everything. He even speeded it up so I got it only five days after my test drive, and that was over the Easter weekend.) The insurance company were prepared to play ball (I didn't even have to cry) and so I got several hundred pounds more than I think I'd have got selling the car myself, and saved the hassle.