In the two centuries after 1700 there occurred upwards of twenty million marriages in England and Wales. It is perhaps forgivable, therefore, that this paper has about it the air of an interim report. It might be thought doubly foolish for an individual, and in this field a professedly amateur investigator, to embark upon any enquiry into past demographic behaviour when there exists that formidable, professional task force, the Cambridge Group for the History of Population and Social Structure. At the last count it had within its lockers, for example, ‘aggregate analyses’ of over 550 English parishes. To provide information about the ages at which people married, however, the Cambridge Group appears to be relying primarily upon ‘family reconstitution’ techniques. It is not necessary to explain these techniques or to describe the remarkable light they have shed on the vital events of the past. With such tools the Cambridge Group have not only crept literally between the sheets of history; its individual members have not been abashed at publishing their preliminary findings. Yet obscurity remains and with it the thought that family reconstitution may not prove entirely adequate to the insistent demands for more information on when and why people married. For the undertaking of full family reconstitution both registration and record survival have to be good, and the method is undermined where there is a great deal of migration, albeit temporary or permanent. Unfortunately many of the most interesting demographic questions revolve around urban behaviour, and town records may be deficient on many of these counts, especially in that vital and perplexing period from about 1780 to 1840.