My best guess is that your cluster was exposed to some type of electrical charge that corrupted your mileage data. The mileage is stored in encrypted form on an EPROM chip located on a circuit board in the cluster. You should be able to reprogram the chip, but that is a fairly complex process that requires some specialized equipment. You can read what I learned about programming a gauge cluster including step-by-step instructions here:
Programming a 996 Cluster to Work in a 986 - Rennlist Discussion Forums
Unfortunately, I don't know the encryption protocol that would allow you to substitute your actual mileage for the corrupted data. There may be a shop in the UK that can do it for you. (Check Boxa.net) In the U.S. I think Palo Alto Speedometer and North Hollywood Speedometer offer this service. I've heard that they charge about $200-$250 to program it.
I hope that someone else has a better suggestion.
Good luck.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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