You'll need a first or 2:1 UK Honours degree, a merit or distinction at Masters level, or overseas equivalent, normally in a relevant social science, business or science subject.

If English isn't your first language, you'll also need to have a recent UKVI recognised Secure English Language Test (or a SELT) qualification.
During the application you'll be asked for the following:

your full contact details
transcripts and certificates of all degrees
proof of English language proficiency if English isn't your first language
two references, one of which must be academic
funding or scholarship information
research proposal detailing the subject area and topic to be investigated. Please use our Postgraduate Research Proposal Outline.
By filling these details out as fully as possible, you'll avoid any delay to your application being processed by the University. Incomplete applications will be returned to applicants.
IELTS - minimum overall band score of 6.5 (no individual test score below 5.5).