I've had my car 1 year this month HSE R-Dynamic P250, received in Oct 2018.
I also had the coolant pump change because of the loud fan issue back in December/Jan, not convinced it fully fixed the issue I do sometimes hear a slightly louder noise from the fan randomly but only a fraction of what it was, if I didn't have the prior issue I wouldn't notice it.
After about 8 months and a long (4 hours) motorway journey the coolant low light came on, looked at the coolant level under the bonnet and it was low, dropped into the nearest Jaguar garage who couldn't find a leak and topped it up.
4 weeks later on a similar journey light came on again, it was low, I used water this time since Jaguar apparently have not released the coolant type or Halfords didn't have it on record.
I've been topping it up if I notice it low, with water, if the weather temperature started dropping I'd have sourced the correct coolant.
I don't drive it very often at the moment and waited for its 1st service this week.
Jaguar did a pressure test which failed, they then topped up the coolant correctly and apparently the pressure test passed. They kept the car 2 days trying to reproduce which included some motorway driving to bring it up to temperature but still nothing.
So I've agreed to take it home and bring it back first week in Dec for them to recheck.
Personally, I'd have replaced the relevant parts which I'll push for if it happens again.
On the plus side during the service they performed a software update, I now have apple car play

I asked about it back in Jan with a different dealer, the response being did I pay for it? it wasn't an option when I ordered my car. Lack of service with the 1st dealer is something I'd unfortunately gotten used to.
Paying for a premium brand doesn't necessarily mean better service. The experience with the new dealer has been much better though.