Postgraduate masters in the UK can either be 'taught' degrees, involving lectures, examination and a short dissertation, or 'research' degrees, which involve the production of a thesis after a period of research. Both types of programme usually involve 1 or 2 years of intensive and demanding full-time study.
Taditionally, postgraduate Master's degrees were awarded without grade or class. However, Master's degrees are now usually classified, either into three categories (Pass, Merit or Distinction), or simply two (Pass or Distinction). The average marks required for these classes are generally 50%, 60% and 70%.
The Master of Research (MRes) degree is a more structured and organised version of the MPhil, usually designed to prepare a student for a career in research. For example, an MRes may combine individual research with periods of work placement in research establishments.