So, by way of an update to my problems...
I've soldered and made good the broken wires to the connecting jack at the inside of the rear left wheel arch, added some convoluted tube to protect this cable better and taped it all up.
I still have no speedo, vacuum pressure (economy gauge), and several warning lights in amber on the cluster. My next step was to disconnect the battery for 24 hours to see if this does anything? The manager at a German car centre where it was scanned, said it was symptomatic of possible steering angle sensor failure, however at the time they cleared any error codes, the severed wires were still not repaired properly (just twisted together and taped up).
Vehicle seems to drive fine, however every now and again when travelling at highway speeds, I hear a warning 'chime' but nothing changes on the cluster.

Would be in your debt if anyone can suggest what to do next?

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08/06 build 4.4i Stirling Grey over black