Good weather so finally got around to stripping the dash.
It was indeed the display unit. Got it out,,opened it up and spotted some verdigris on the pins of the internal main micro ribbon cable connector. Carefully disconnected the ribbon cable and cleaned both ribbon cable and connector with a fibreglass pencil. Reconnected and reinstalled it, all working fine which was a relief as I guess it would be a costly dealer diagnosis and fix.
No idea how moisture got in there it's pretty much sealed, no other sign of it.
Hopefully of help to anyone with a similar problem. Plenty of videos online as far as stripping the dash goes, just a Philips screwdriver, 7mm socket and trim tool required, all fairly simple.
Edited by A3 A4 on 03/04/2021 at 18:59
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