Cookbooks, one of the book trade's richest earners, reached new moneyspinning heights this year, according to the analyst Nielsen BookScan.

Jamie Oliver's Jamie's Dinners sold £7.4m worth, Gillian McKeith's You Are What You Eat Cookbook £3.2m and Nigella Lawson's Feast Food That Celebrates Life £3m, helping to give food and drink books nearly 22% growth since last November.

Sales of children's books rose 23%, invigorated by the latest Harry Potter (right) and rising popularity of other authors. Fiction grew 5% in value, non-fiction 3.3%. The overall books market was up 6.3%.