The first question to ask yourself is - can you afford to run the Jag throughout the year?
If not a SORN for 6 months will help a little.
The answer may be yes but other factors muddy the waters.
The RX is a very practical car, compared to the Jag.
Would you be able to live your lifestyle with just the Jag?
The ongoing costs of the Jaguar might make you feel uneasy, even if you can afford it.
You need to weigh all these ponderables and either let your head rule your heart or the other way round!
I would be interested to know what you decide and why!
I have a similar "problem" with my LS400.
I don't really need to run two cars.
I do a low mileage in the LS for the cost of insurance and road tax.
Whenever I drive it - I do not wish to part with it. I will never be able to get another example like it.
As I rely on garages to maintain my cars, the crunch will come when I need to decide whether to spend money on the old girl or say goodbye.
As people have stated, the LS 400 is getting on in years and there must come a time when it gets to the point that they are either too expensive to fix or can't be fixed.
If I had to make a choice between my NX300h and the LS - the NX would win for many sensible reasons. They main ones being practicality and reliability.