Context: Graduate has a third in their undergraduate degree from a world leading university on a notoriously difficult course (Cambridge mathematics BA) and wants to apply for postgraduate study elsewhere on a slightly tangential course (taught theoretical physics MSc). Assume that the student has the capacity to cope with postgraduate study and is able to fund themselves (i.e. had some non-academic circumstances that led to the third).
Are there any such MSc courses out there in the UK that would consider an applicant with a third? Would such an application be competitive? Does the fact that it's Cambridge maths help, or worsen the issue? What could be done to improve the chances of finding a place?
And feel free to add anything else that may be relevant but isn't covered by the questions above.
Thanks in advance!