One option would be to utilize an app like Waze for your smartphone. It can alert you to fixed speed cameras as well as transient issues like mobile speed cameras, accidents and construction.
We also have a dashtop Garmin that we use in my wife's vehicle that shows the reported speeds and give us an audible warning when we exceed the speed limit that it has in the database (not always accurate but it helps). When we used it in the UK, it displayed the equivalent speed limits in kph.
The Head's Up Display (HUD) is an option that displays information onto your windscreen. An example video:
I don't know enough about the other years and I don't have a UK-spec vehicle, so I don't know that I could provide you any help with the system settings side. Good luck.