Thank you for sending in so many requests for free tickets to the Royal Academy's Living Bridges exhibition; these are on their way to the first 25 envelopes opened. I am sorry to disappoint the rest of you. The exhibition continues until 18 December and is well worth a visit.

For those who have to know, or are about to start an architecture course, the latest edition of Sir Bannister Fletcher's essential and all-embracing A History of Architecture is now available, published by Heinemann, price pounds 75. A third of the text of this weighty 1,800-page tome is new. It has been edited by a brave Dan Cruickshank.