First published in 1985. This book is the first of two volumes and is the culmination of a major research programme on the monetary history of the United Kingdom. This volume contains monetary series ranging from detailed balance sheet material to monetary aggregates such as M3 and are in monthly, quarterly and annual form. The data are drawn mostly from primary sources in the early part of the period and from more accessible published sources for more recent years. Critiques of existing series are given and assessments of the value of different sources are provided. The user should be able to build his/her own series from the basic constituents given here. This source and assessment of data should be an essential reference to economic historians and applied economists with an interest in the British economy over the last one hundred years. But it will also be of interest and use to the students of money and banking and to monetary economists of other countries.