I live in zone 2 in London, and the fastest broadband I can get is ~2Mbit. Even in major cities, good - or I would argue, even acceptable - broadband is not ubiquitous.
Not the OP, but in the same situation until I moved: Close-ish to an exchange (so no street cabinet on the line for fibre equipment), no cable coverage (so Virgin is out), out of range of wherever the hell Relish's tower is, and ancient wiring in a block of flats (so can't reach sane ADSL speeds).