Did you just look as I suggested? They are all different. In some circumstance the GDL might help, in some it inst needed and in others it will be insufficient.
Sheffield University
Entry requirements
We normally require a minimum 2:1 honours degree, or international equivalent, usually in law or a subject with a sufficient legal component. Other qualifications will be considered as will applications from candidates with work experience in a relevant field.
Nottingham University
Entry requirements2.1 (or international equivalent) in law, humanities or social sciences
Bristol University
Entry requirements An upper second-class honours degree in Law or a degree with an adequate law component. International students with equivalent qualifications should supply a transcript of their examination results (an official English translation if the original is in a language other than English).
Warwick University
Admissions Requirements If applying for one of our LLMs, we would normally expect you to have at least an upper second class honours degree in law or its equivalent from your home country. If you hold a good lower second class honours degree or equivalent and practical and/or other relevant experience then you may also be admitted, in appropriate circumstances. If your first degree is not in law then you may still be admitted, if we are satisfied that you will be able to complete the relevant LLM satisfactorily.
Birmingham University