Gardiner's Atlas of English History - maps from "A School Atlas of English History" (edited by Samuel Rawson Gardiner, M.A. LL.D. and printed in London by Longmans, Green, and Co. in 1892).
The Landmark Information Group have provided free online 19th Century Ordnance Survey maps linked from an extensive gazetteer. These are at a scale of 1:10,560 (6 inches to the mile) and cover all of Great Britain (England, Scotland and Wales). (Maps vary between 1840 and 1890.)