According to the manual it should appear under driving data but does not. I have checked the list of items in settings that can be turned on and off and I also have oil temperature and digital speed but nothing on speed warning. I think you are right that this has been disabled somehow and must be enable by coding.
Well you've certainly been round the houses on this
@Steve M, but at least our findings are consistent between our cars as far as the menus are concerned.
I've done a bit more research on this and it seems to be a common complaint and is not limited to VAG cars. Do some Google searching.
Discussions on other forums suggest that some countries have a legal requirement for cars to be fitted with this warning, and it can't be (easily) turned off or the speed setting altered. The chosen speed is set by the manufacturer for the particular country the car is originally sold into, and uses the national speed limit.
So it appears that on our two cars at least, the Speed Warning feature described in the manual, where the driver can set the speed, is maybe only for certain markets and seems not to be fitted/enabled in UK spec cars, but it can possibly be enabled through coding. Here is a link which shows some photos of how it should appear in the driving data menus ...
How to set a speed warning on your VW dashboard
But that isn't what is causing your issue.
My guess is that for some reason the national speed limit warning has been enabled on your car (and some others posting on the same issue). I don't think this is currently a legal requirement in the UK, otherwise myself and lots of others would be experiencing this warning and that is clearly not the case.
However, the first post in the forum thread at the link below actually shows coding for enabling/disabling this warning on a mk7 Golf R so there is a good chance there will be similar coding for the T-Roc. It is your responsibility to make sure this is legal in the UK, but since my car doesn't have it then I think it will be ok.
Yesterday I did my first highway drive since picking up my R last week, and kept getting a speed warrning at 120km/h. I know there is a setting on the dash where you can set a speed warrning, but mine was set to 150km/h. Later I turned it off all together but I kept getting a warning every...
www.vwvortex.com
This is similar to some UK T-Rocs being able to automatically switch the clock/time setting back and forth between GMT and BST on the appropriate dates, while other can't. The manual says it should be automatic and the coding option is there but some cars seem to have been set up differently (wrongly).