Studying abroad in London without getting credit for it

Hello everybody :-)
I'm currently studying in Austria and would like to study abroad in London. The problem is that I can't study abroad in the UK with the course I chose at my university. I mean I could, but they don't offer it as part of Erasmus and the department doesn't have a partnership with any universities in the UK.
My dream would be to spend a semester or year at King's College in London.
Does anyone know if I could still study a year in London? I probably won't get credit for it at my Austrian university but it would be ok for me to study one year longer because the modules King's offers sound reeally interesting to me and for me it would be totally worth it!
Is the application process for international studens who want to organize their year abroad individually harder than usual?
Maybe someone can help me, thanks in advance! :smile: