Hi Mark - thanks for the questions, if you were wondering this then I suspect others may be too! The good news is that there is no need to go to the home screen to plot a route, just click the CLEAR button in the bottom right hand corner of the route planner map to clear any existing routes you may be viewing or editing and then you can start plotting a new route.
There isn't a way of setting a default start point for plotting routes but we do have two easy ways to quickly locate places you regularly use:
1. The Locate Me icon (on the left of the search box) will find your current location.
2. The Bookmark icon (next to the Locate Me icon) lets you bookmark and quickly retrieve places you use often.
Hope that helps.
I may be missing something simple here. If I want to plot a route myself I have to go into the home screen to use the plot a route button each time. It would be good if this button was on the main map screen. Also can I set my home address as the default start point for all routes.