I'd be very careful of not taking maths alongside physics. Over the past couple years, with my exam board certainly, the physics exams have been more and more maths focussed. Those without A level maths potentially struggle with some of the trickier questions, and are certainly at a disadvantage to the majority of candidates who do have maths.
At the moment, my college runs a compulsory maths class for those without, but is pushing for maths to be compulsory for all physics students because of the disadvantage they feel those students without are at. If I were you, I'd either teach myself the key bits of the maths syllabus, ensure the college runs additional maths classes but ultimately I would take maths and do mechanics because that's the most helpful module - and I know that because I took statistics and always wished I had done mechanics!
Basically, if you choose not to do maths, beware that you will need to extra maths off your own back if necessary because there is a lot of maths in the physics course.