It is not only the InControl software, the keys cannot be hacked, but that is only on newer models. It is a much better system than used by BMW and Mercedes who just send the key to sleep when it does move for a period of time. Range Rovers were indeed a favorite target and that is why JLR have adop...

i could not resist!

As mentioned above it is a known problem, take it to the dealer as sooj as possible before any serious damage is done to the electronics.

If there are those sorts of issues then those will obviously have to be fixed as well. under warrabty.

You have registered on the web site presume? https://incontrol.landrover.com/jlr-portal-owner-web/dashboard

Also for maps? https://www.landrover.here.com/#home/0

You know it is a desert in here?

Why not ask in the other place where there are living breathing D5 owners!

On steering column?

A few posts below https://www.disco5forums.co.uk/viewtopic.php?f=11&t=4353

https://teamtalk.jaguarlandrover.com/news/jaguar-land-rover-models-are-the-only-cars-immune-to-keyless-entry-attacks

Where have you read about high levels of theft for Disco 5's? They are one of the most secure cars around.
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You have 3 years subscription included for any Incontrol options that you have, not sure what a Landmark is I am afraid!