My wife (Nigerian) has leave to remain in UK for 2 years. We applied for a Schengen visa to go to Spain for one-month holiday which we did then came back to UK. She still has 4 months before it expires (it was a 6 month visa). Can we go directly to any other Schengen country now for another holiday, or do we have to go via Spain as they issued the visa? We would like to go to visit friends in Belgium.
If the visa is multi-entry visa then the answer is yes, she can go to any other country within the Schengen area.
If the visa is a single entry visa, then no, She can not go. She has to apply for a new visa.