The LEL course throws up some interesting effects. The section from Edinburgh to Brampton can be predominantly headwind. It's got long shallow hills, and when it's calm it favours lighter climbers. With a headwind it favours those with more power to frontal area, Tandems, recumbents and heavier solo riders.
The prevailing wind on PBP is such that those who reach Brest can usually be more relaxed on the return, which suits the way fatigue sets in. LEL can be the opposite. All planning needs to consider the wind conditions, which will be unknown until the ride happens, You also need to know what direction the course takes, which is something you won't know without looking at a map.
A graphic of average speeds between controls for the whole field, plotted on a map would be useful, especially correlated with wind conditions.