Hi Simon,
I am not from the UK but my wife is. We are going back next month for a visit. Thorpe Bay in Essex. Where abouts are you?
We just bought a SRT6 Coupe a couple weeks ago. It only had 9,950 miles on it. Now over 11K. Fun car. The transmission acts the way yours does. I wish it had a manual but then the wife would not have let us buy it.

My other driver is a slightly modified 2002 WRX. I think the scooby is faster up to about 70 but then the SRT really moves out. I too was very impressed at the Crossfire 80 mph+ acceleration.