Just a bit of info for people. The guidance lines on the screen when reversing disappeared. The parking sensors still worked ok but no lines visible on screen.
The fault that I found was the wiring loom between the boot lid and the boot. There were several cables broken through general wear and tear of opening and closing the boot.
I replaced the loom with a brand new one which is very easy to do. There are some guides on YouTube if your not sure.
Everything’s working as normal now.