I have downloaded the BAe 146 and have used Matthias's notes to the letter to sort out the Panel, but I am still not getting he panel up when i open the aircraft in FS2004. I have pasted below the part of the pdf file
that confuses me, perhaps someone can explain it to me, as I don't understand where or what the files to be extracted to a self made back up file are.
here is the part I don't understand.

Because of the complexity of this panel it was necessary to make some changes in the
aircraft.cfg and airfile. I did not change the flight dynamics of Jon’s great BAe 146 but
make some changes in the fuel, electric, flaps and radio section. If you are using Jon’s
BAe 146 it’s very important to use the replacement files. Otherwise almost all parts of
the panel don’t work as they should.
The included replacement files are:
Jon Murchison BAe 146-200 QT.zip Replacement FDE files for Jon’s BAe 146-200
QT (Freighter) aircraft.
Jon Murchison BAe 146-200.zip Replacement FDE files for Jon’s BAe 146-200
aircraft.
Jon Murchison BAe 146-300 QT.zip Replacement FDE files for Jon’s BAe 146-300
QT (Freighter) aircraft.
Jon Murchison BAe 146-300.zip Replacement FDE files for Jon’s BAe 146-300
aircraft.

Before installing those files please check which of Jon Murchison’s BAe 146 you use.
When I’ve finished this panel Jon had already completed the 146-200, 146-200QT, 146-
300 and 146-300QT (QT stands for quite trader – the BAe 146 freighter aircraft).
Now make a backup of the already existing aircraft.cfg and the *.air file in your BAe 146
aircraft folder and unzip the correct replacement files into this folder. If you have installed
some further repaints for Jon’s aircraft please don’t forget to add them once
again in the aircraft.cfg.

Forget this request folks, I have solved the proble.
John