A Li battery's life is actually reduced when it gets charged to full all the time. JLR, like other manufacturers, prevent full charges for that reason and quit charging when they're at about 97% of capacity. This is to mitigate the detrimental effects. They will insist that charging to that level (their "100%") does not damage the battery.
However, nuance is important here. It does not damage the battery to always charge to full, but there is ample scientific literature showing that battery life is extended when it is neither fully drained nor fully charged all the time.
I was thinking about this very thing today after reading some other posts about charging to 80% and was considering starting a new thread.
There are plenty of reputable places where folks can see that the MFG has already handled the head and tail buffers of the battery. The biggest threats being Heat, Heat, Heat and age. Frequent use of DC Fast Chargers can degrade batteries over time, Storing (weeks) at 100% state of charge can degrade, but again the MFG has added a buffer. The car was designed to handle all the stress for you and it manages Heat very well.
For anyone who wants a few things to read I'll post three links below. The conclusion should be that charging to 80% or 100% is just a personal choice with little benefit or damage from your choice.
CleanTechnica has an easy read with a less technical look at why it's okay to charge an EV to 100% if that is your wish: https://cleantechnica.com/2018/08/26...an-ev-battery/
Battery University has section 1003, 1003a, and 1004 explaining lots about benefits, charging, and storage of an EV battery system. 1003 explains again what the MFG has built in for buffers and why your battery is protected - https://batteryuniversity.com/learn/...ric_vehicle_ev
GeoTab has a really good study of over 6000 EVs, with a database that looks at battery life and degradation. Unfortunately the Jaguar is too new to be in the database, but there are lots of others models to look at the life of the battery overall - https://www.geotab.com/blog/ev-battery-health/
The point is that if your car is a daily driver, you shouldn't worry about charging to 100% unless you want to worry. Charging to 80% max + the factory buffer gets you a modest benefit over 8 years, but only a modest benefit. It's really a personal choice. Your warranty is already baked into the chemistry, the thermal controls, and the charge/discharge rate needs of the car. Enjoy.