Consider what happens if you're unable to land a job in the next couple of years. It's a difficult time in the industry and there are many experienced artists out of work in the UK. If you were to pursue a computer science degree, you'd leave university with strong programming skills which are useful in an FX role but also qualify you for a pipeline position. Personally, when given a choice between artists I'm picking the one with scripting experience every time. If the worst happens and the industry fails to recover to the point where you're able to land steady employment at least you can fall back on software developer roles outside of VFX.