When you are creating a route extra information in the route box now shows the overall gradient, either ascending or descending, as both degrees and as a ratio e.g. 1:7, like for road gradients of old. Here's an example for Scafell Pike:
As you can see the overall gradient is 16.2° or 1 in 3.
We think this may be useful for you when route planning as the profile we display generally exaggerates gradients a lot and is only to give you a rough feel for the overall nature of the route.
At this time of year it may also be useful for assessing avalanche risk on slopes if you set up a two point route across the sloping ground (most slab avalanches are triggered on slopes between about 25° and 45, with 36° to 38° being the most common angle).
Do bear in mind with all of this that these angles are both overall (so the route is probably both steeper and less steep than measured, especially as the route gets longer) and also relies on OS data height which is only sampled every 50m so it's only approximate.