Formed in September 1920 with the amalgamation of the Stratford Co-operative Society and the Edmonton Co-operative Society, with other societies jouing thereafter. It amalgamated with the Co-operative Retail Society in 1981. The archives are at the Bishopsgate Institute - details can be found at [1] The Wikipedia page is [2], which itself merged with the larger Co-operative Wholesale Society, to form the Co-operative Group (CWS) Ltd. in 2000 (Wikipedia page [3]).