Description: These revisions were made as a response to town planning requirements in selected development areas. Some of the areas revised however do appear to be somewhat arbitrary. These revisions were the last made to 1:2500 mapping until the National Grid series was commenced in 1948 although this was not fully completed until the 1990s.
Description: In 1892 it was decided that the First Edition 1:2500 mapping should be updated and that a revision programme should be initiated such that no mapping should in the future be more than 20 years out of date. This would be done on a county-by-county basis.