If I recall correctly, the exception is in Scotland, where the undergraduate programs tend to be more like America's: 4 years of study with emphasis on broad liberal arts education in secondary and higher education. I remember when applying for colleges in the U.S., our councilors noted that while it's virtually impossible for an American to apply as a full-time undergrad at English schools, particularly Oxbridge, due to incompatibilities in our educational systems, it's perfectly feasible to go from an American high school to a Scottish undergrad program (aside from the obvious travel and visa hurdles).