I have a single entry Schengen visa from the Czech embassy in London due from March 22, 2015 to April 12, 2015 and the duration of stay is only 7 days. I planned to stay in the Czech Republic from March 22, 2015 to March 28, 2015 and then fly back to the UK. However, I also want to travel to Germany from April 5, 2015 to April 9, 2015. Could I, at this stage, apply for a new Schengen visa from the German embassy, or should I cancel the Czech visa first and apply for a new one?
I am a Chinese international student but study in the UK.