So compettitive that 60% get rejected from all their choices
Med school is 5 years, 6 years if you decide to intercalate (do another degree in a year, usually between pre-clinical and clinical years in a science degree), 9 years if you intercalate and do a PhD
There is no such thing as residency in the UK, however I hear that foundation training is 2 years, after that it varies depending on what speciality you choose and it gets a tad confusing from there :P