As above, A-level Physics, to it's eternal detriment I might add, is purely algebra based, not calculus based. As such, it won't cover anything (or much of anything) beyond GCSE level Maths. Psychology is fine as an option, although be aware you'll need to do maths in that as well (statistics). However I found 6th form psychology to be tediously boring, so...caveat emptor.
Dispel notions of "soft" and "hard" subjects when considering them - the only relevant distinction is academic vs applied/vocational, as that's more or less where the line gets drawn at what is preferred, and this is due to the fact the former are specifically preparing you for university study, both curricular and in terms of transferable skills, whereas the latter usually aren't (this isn't to suggest the latter aren't worthwhile in their own right, but if your intent is to apply to university it's best to avoid it).
If you enjoy and are interested in the sciences, you may want to consider Geography. It is about 50% "physical" geography at A-level, which covers aspects of the natural world and complements your subjects well enough. It's often taken by students planning to study geology/earth sciences and similar, and some universities will consider it as a science subject for such course (such as the SOES courses at Southampton). You may find such earth/environmental focused science to be something you are interested in, and there are biological and chemical aspects to this (from traditional paleontological and mineralogical/petrological aspects of geology to more modern and integrated considerations of climate science, biogeochemical cycles and earth "system" science).