Do you need a master's degree to apply to LSE MRes/PhD? I'm not entirely sure from the website.
This is from their site; it seems like a master's is not necessary for Track 1.
[h=4]MRes/PhD[/h]Your entry qualification determines which track you will follow if your application is successful. For entry onto either track, candidates should have, as a minimum, a first or upper second class honours degree, or equivalent, in a closely related discipline. Track 1 students fulfil the entry requirements for a master's degree and follow the 2+2 structure laid out below. Track 2 may involve an exemption from some of the taught courses and will only be recommended by the course conveners if, in their judgement, a student already has appropriate prior training in quantitative methods and has already completed an MA or MSc in a relevant discipline. Upgrade to the PhD depends on successful completion of the MRes in either track.