Any ideas why I have no display but the screen is on?
If I wiggle the blue plug in the boot, the screen flickers - its either a loose wire or the tv unit is shot:

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I had that when I swapped to the OEM hybrid tuner, and had not pushed the blue plug down enough. Pretty sure its the blue one.

As yours had previously been working though...........water / damp ?

Is there a way you can connect the loom on to the sat nav and bypass the tv to try and get a picture ?

From memory though, so it could have been bypassing the nav........so may be worth a search on here first !!

Sorry its a bit vague, but it was some time ago, and being in my 40's, my memory is not what it was !!

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport