Thanks Matt.
I originally suspected that my cluster had previously been substituted for one with lower mileage but was told by the workshop that inspected it prior to purchase that this was not possible as the mileage was stored in three different locations and that the display would show the highest reading. Now that you have proved this wrong, I can see why I had so many issues with my low mileage purchase. Three years on, and with help from this forum (thanks 43sqd), my to do list is short, but my knowledge of this vehicle is now pretty good.