[Somerandomguy]

For the sake of completeness, I have now resolved this by replacing the cluster.

I managed to source a cluster from ebay with the same part number and swapped over the major components to diagnose that the main circuit board was kaput. Swapping this over left the cluster in component protection- not a nice thing to see, no interior lights on any panel, only the speedo dial working (a bit pointless at night as I couldn't see it anyway due to the lack of lights) and several warning light lit.

A visit to the dealers with the old and new clusters and 1.5 hours later i have a fully working cluster with the correct mileage, yay