Are Land Rover liable if their navigation update broke my Range Rover Evoque's navigation system?

I brought a Navigation update from the Land Rover website for my 2012 Range Rover Evoque. The update didn't work so Land Rover suggested I got a new USB stick from the Netherlands and let them install....

Who is reponsible for updating sat nav information?

A local road had its speed limit reduced from 40 to 30 in August 2023 but the GPS in my car still shows 40. Who's job is it to get a database updated when a speed limit is changed?

Why has my VW satnav stopped giving traffic updates?

My satnav no longer picks up traffic, roadworks etc. VW tells me it is no longer supporting its own satnav. Is that genuinely true?

My daughter bought a car with sat nav but it's missing the SD card, can I ask the dealer to pay for this?

My daughter has bought a secondhand Mercedes A-Class and subsequently discovered there is no SD card for the sat nav. Does she have any rights for the garage seller to pick this cost up? What kind of...