http://www.belgium-embassy.co.uk/
Consular section->Documents to be produced for a visa request.
The following documents are required in order to obtain a SCHENGEN visa :
1.Your national passport valid for at least three (3) months beyond your
intended stay
2.A United Kingdom residence permit valid for at least three (3) months
beyond your intended stay
3.A Re-entry visa for the United Kingdom valid for at least three (3) months
beyond your intended stay
......
So I guess he cannot ap
