It can be meaningless in the situation that your V1 is the same as your Vr ie the runway left is more than your breaking distance required from Vr speed.
Light TP's which are pref A often have V1/Vr being exactly the same speed. And basically if the runway is longer than 2000m they don't even bother giving you performance tables. You just go straight into your climb performance.
The best book to get your hands on is Aircraft Performance Theory for Pilots by Swatton.
Or he has a second addition out but its a bit pricey at 40 quid new.
You need to go through what all the different distances are and what they all mean. As well as what the different speeds relate to.