JLR, in their wisdom, no longer include it. I suppose they just assume that a Jag owner will just leave it with a man to sort it...
Given that they CBA with a spare wheel on my XE, it wouldn't have been much use anyway.
And I bet the gunk is out of date. And nobody knows how to use it anyway, and just shove it in with the air, and wonders why it doesn't work, and....
...breath!
KW - loads of breakers tend to sell spare wheel kits (wheel, foam insert with jack/wrench etc), new boot floor and the longer standoff. I paid around £140. Well worth it IMHO. Though I had to make a new standoff, as there appear to be 2 thread sizes, M6 and M8. Bit of M8 rod, some nuts and a 3d printer solved that.
I have an extra full-size wheel in the garage, so could probably sort myself out if anything goes wrong relatively locally. Further afield, I'd probably have a boot full of junk, so not sure I'd be happy losing the boot space to it.
I also have a set of puncture repair plugs that have sorted out the odd screw in a tyre before. Granted the only tyre failure I (well, mrs. KW) have had on the XE would have been a struggle to repair because the wheel dropped off the edge of a road with a non-existent verge and the inside sidewall basically ceased to exist.
That was only really awkward because she was on the way to rescue me when the battery in the Westfield carked it so it was 2 simultaneous roadside callouts.