6th Edition. — Routledge, 2006. — 504 p. — ISBN13: 978-1405832557.
Lucid presentation of a fascinating subject with pictures and sketches of (arguably) the oldest seat of democracy. The recent departure from European Union is perhaps an important point that may be covered in the next edition. Otherwise most of the text remains relevant. The authors are experienced officials serving the houses of the Parliament. So they have first hand knowledge and experience of the subject.