The cottage industry in books by Khushwant Singh grinds on. Not to be outdone by Roli's ingenious way of repackaging his Train to Pakistan as an illustrated book, the usually sober Oxford University Press has decided to sex up one of his bestselling titles with them: History of the Sikhs. Instead of the scholarly two volumes, recently updated up to Manmohan Singh ascending the prime ministerial chair,OUP plans to launch an illustrated version in a single volume. The USP: rare photographs collected from museums and libraries around the world.