Mark and Kezo have replied better than I could have done!
My only additional point is that 200 miles from an iX1 would be an almost worst case scenario during winter month, so any additional miles you get in warmer weather can only improve on the calculations above.
Also, and I know money is not a major factor in your decision, remember that Motability no longer supply a charging point FOC for PHEVs, just EVs.
Is there any reason why you would not switch to an Intelligent EV tariff like Octopus Intelligent Go? At 7.14p per KWh, it really does make sense. Octopus are still offering me occasional 3 hours of free daytime electricity once or twice per week which is brilliant too.
2024 - BMW i4 Grand Coupe eDrive 35 Sport
2020 - Volvo XC40 T4 Inscription
2017 - Audi Q3 TFSi Sport S-Tronic