I doubt I’ll keep the car past 3 years, mmmmmm help
The obvious thing to do is get some prices for a PCH and PCP 3 years deals, and then go from there, the average I can see is about £21k for a PCH with ~£1,600 upfront, plus mileage costs. If you are buying the LR at £47,990 (no options changed) you need to guess the deprecation, will it be more than £21k?
For the sake of keeping it three years, and the rate that Superchargers and other fast charging networks are being built, an SR+ seems like a much better choice for a lower overall cost, with little to no difference in experience terms. How often are you going to be limited in those three years by the reduced range? You have a 3-4 month period every year where you won't be achieving the best mpkWh, possibly a bit more depending on the climate in the blooming country.
Obviously there is more to think about, but that is a good starting point if you are seriously considering about it.