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British Library Georeferencer Project
View historic maps along side modern-day mapping. The British Library began a project to crowdsource the georeferencing of its scanned historic mapping in 2011.
http://www.bl.uk/ georeferencer/ georeferencingmap.html
National Library of Scotland Maps offers access to current mapping for Scotland, but also historical maps for the UK too. Disover old maps of Bedfordshire in the 'Series' section.