This excellent mapping tool, supported by Ramblers-Webs, allows you to:

• display your own walking routes - contained in a GPX file
• toggle a Smart Routing option
• edit the route
• create a new route
• simplify the number of points defining the route
• reverse the direction of the route
• add or modify markers
• delete items
• display the elevations of points along your route
• save your walking route to a GPX file

Tom's favourite mapping tool. A well-tried app with a dual map display of Google Satellite and Ordnance Survey 50K and 25K maps. Handles GPX route planning editing and download/upload. Excellent Help file. 

Ramblers Central Office provide their own interactive map showing hundreds of tested routes to download.

Thousands of free walks to download  compiled by John Harris. Just lick on the county where you want to walk.

As well as providing a tool to draw a route and save it as a GPX file, this app offers many more tools to convert and edit GPS data.