The Pevsner architectural guides are around halfway through their revisions — though it is like the Forth Bridge, and soon it will be time for the revisions to be revised: it is 30 years since the new London: 2, for example. Aficionados have keenly awaited the Cambridgeshire volume, the latest in the series, because of the substantial new building undertaken by Cambridge University since Pevsner himself last catalogued it in the early 1970s (his first edition appeared in 1954).