I find the attitude of the selection company a little strange, to say the least.
On the application form it is stated, postal applications only, or words to that effect.
No email address and "registed" post will not be accepted. Do they not have computers? They have a little more faith in the Belgiun mail system than I do. Maybe they are under the impression they will have more replies than they can handle.
I sent in an application and have not had a reply and I am rated on the A/C with a EC licence.
Maybe the above is a possible reflection of the operation they intend to run.