walkit.com is the urban walking route planner
Covering a number of towns and cities in the UK this site provides a really useful tool for planning a route on foot between any two points, including your journey time. For additional health interest it also offers calorie burn, step count and carbon saving for your journey.
The team don't pretend that you can substitute walking for all the urban car/bus/taxi/tube/metro trips you make. But this helpful tool does help to make more informed decisions about whether it is practical to walk for all, or part, of any given journey, particularly when visiting an unfamiliar place.
walkit.com is also available from the App Store and Google play.