short term screenwriting or novel writing classes?

Hello!
I am an international student studying in London at the moment doing a Master in Social Science. But my passion is in film and writing. I am thinking of taking some short term classes in screenwriting. I am looking at the following but I don't know their reputation. Any thoughts? Anyone with experience studying at these institutions or these programs specifically? Are they worthy? Thanks very much!

Central St.Martin - screenwriting - 10 weeks/£350
http://www.csm.arts.ac.uk/shortcourses/mediaarts/eveningandweekend/scriptwritingandstoryboarding/screenwriting-beginners/

MET Film School - screenwriting - 12 weeks/£800
http://www.metfilmschool.co.uk/courses/part-time/writing-for-the-screen.aspx

City University London - Novel writing 10weeks/£220
http://www.city.ac.uk/courses/short-courses/novel-writing-and-longer-works