We have been warned for a while that the County Council website was changing. The map of footpaths and bridleways has now moved. Links on this website have been updated. If you have the page saved as a favourite do an update now.
I don’t like to report this but the Derbyshire County Council map of paths is better see:
Derbyshire Map of Paths the online map is good but the Def. Map has errors take care.
Staffordshire is also quite good
Staffordshire Map of paths takes a bit of practice to find your way around
Nottinghamshire does not have online mapping.
For what is available across the country see: