Dear pilots,
I discovered, that the EuroBusiness Concorde FDE (Flight Dynamics) was not updated for FS2004. With the supported flight dynamics, the plane flew at too high angle of attack, and was unable to reach M2.0 in FS2004.
Now you can download -if have not done it from FSFrance website...- it from the EHB Concorde page.
Have a nice flight with the EuroBusiness SST, and sorry for inconvenience.