Ok, so had a bit of water ingress in the boot, which resulted in corroded terminals on the modules.
The main ones affected are the DSP which has 1 pin broken, never affected the speakers or anything as such (probably the reason for the cd changer not working) and the other module is the silver box, one black plug and one blue plug with 2 small antennae connectors I assume they are. Again, 1 pin broke on this which resulted in the screen either not working or flickering.

So replaced this module and now the screen works great, no flickering. However it no longer gives the menu for dsp, sat nav and the radio does not work.

been to LR today for a diagnostic plug in and they can't pin point the problem. they are assuming it is now a faulty display. which i can't see it being as it is all working. just no sound from the speakers and not seeing the nav and dsp menus on the home screen

As far as I'm aware it all routes through the DSP. That will be the main culprit I suspect Ash
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2016 SDV8 AB

there is one pin broken on the dsp, but i assumed it may have been for the cd changer as everything else always worked bar that. just find it a bit odd how everything stopped working just after changing the entertainment module. could there be some sort of hidden fuse?

When you say the entertainment module you mean the analog TV ?

When the units are powered they should identify themselves on the ibus. If they are not seen on the ibus they will not be on the screen menu, or on the menu in grey not white text.

Make sure all the connections are good. 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