I've just bought an MY 2017 SV LWB L405 and don't know if it has Apple Car Play which I'm desperately hoping it does.

I've got the full build/spec sheet but is there anyway of telling as I still don't know! The car hasn't arrived with the dealer yet but has come from JLR directly, spec is great but I sold my wife's MY2018 and hoping that it does as it's the one thing that let down the older L405 Range Rovers.

It says this on the spec: 10 inch Touch Pro and I think I've read somewhere that 2016-2018 cars can be upgraded by JLR by a software update, any thoughts appreciated. 1994 Range Rover LSE Autobiography
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From what I have read in other places all 2017 model year should be able to be updated to CarPlay. With a caveat that in some countries there were specifications that could not be updated to CarPlay. However since your car looks like a high spec one my guess is that it can be updated.

That said, this is a late reply. By now have you found out if it worked? L405 2016 - Supercharged V6 petrol 380hp

Easiest way to find out is to check the user interface in the center cubby: