Cabmax, Garaad has practically answered your q'n mashalah.
Id just like to add that if you are a graduate with a BSc degree thinking of applying, then you stand a better chance of getting into the 5year course, not graduate entry. Simply because, the 4 year course is highly competitive, they have much fewer places available, and students with MSc's and phD's apply for it, so realistically unless your application highly stands out there's few chances of getting in. I think some uni's have only 44 places for their graduate entry scheme. But also bear in mind that some uni's (very few) do not accept graduates on the 5 year course, for e..g. St. Georges uni of London.
It is competitive, but not impossible insshaAllah if you meet their minimum entry requirements.
Hope it helps.