Thank you for reply and link. It was not looking too good this morning going through the internal fuse box, until I started on the fuses in the engine bay. F26 was the Culprit. Multifunction Control Module 10a fuse had blown. Replaced and all related problems seemingly fixed. Fingers cross...

Ciao to all that read this! In short I have a 2004 Disco 2, which currently state is Central Locking not working on fob/key or internal button. 6 Chimes when ignition is turned on B appears on the mileage display with a slash from top left to bottom right Immobiliser light not illuminated...