Why can't I find a decent job (in Scotland) when I am fluent in 2 languages,with MA DPSI ACIL after my name?

I often read that there is a shortage of people in Scotland with no 2nd language. I am fluent in French and Spanish, my German is not too bad and I'm learning Gaelic. I have the letters MA, DPSI, ACIL after my name and do the odd interpreting job for the UK Border Agency. Why can't I find a decent job where I can put all my skills, qualifications and experience to good use? I'm fed up sending applications, CV's and covering letters and then hearing nothing!! Can anyone help?