Futher to this, I just received my reply from Mitel about this issue that I submitted to bug report.
I've copied part of the reply below :-
>Thanks for the information. Unfortunately, we do not officially
>support the use of driver disks. Some people have had success with
>them in the past, but we don't test or support that feature of the
>installer.
>
>If the hardware is not detected by the installer,
>we are unable to install on that hardware.
In other words, we're stuffed as far as getting other hardware to work with SME.
Anyone know how to fix anaconda and build a custom SME iso ??

Kelvin