CW,
You and the others should look and read carefully the FAQ as there is the direct HR number. If it is not in the FAQ, then it is somewhere in their website.
Once, before the recruitment opened, I called BA Mainline in order to get a number I could join BACF with. They told me that only one number was available to them and this one was internal.
Once again, read the BACF website FAQ and you should probably get the HR number on it.
Regards,
Garba.