Accredited/recognised science degrees

Don't know exactly how it works, but I might have a general idea ( I recently firmed a joint honours engineering degree that is accredited by both relevant institutes).
I would say that in terms of going on to study a postgrad degree, it won't make much difference, but if you want to go into employment directly after your bachelors then it might negatively impact your chances on the physics side of things. If it was a more chemistry orientated job then you would probably be fine.
As I said, I'm no expert, but I hope this helps in some way ( if nothing else then at least it will boost your post - again )
Good luck with uni, regardless of what decision you make.