Pick things you enjoy, certainly, but also consider what you are good at - if you enjoy reading, but you're not very good at writing long form essays, English is probably not going to pan out too well.
Also bear in mind even if you don't take science subjects, you can do a science foundation year as part of a BSc/MSci course at many universities (e.g. Loughborough, Southampton). These are designed for students who didn't take the relevant subjects in 6th form - they're not (primarily) designed for international students to develop generic study skills etc, as with the various international foundation years (such as INTO).