Hi Mark
Oops! This normally only happens when somebody replaces the instrument cluster or the BSI.
The BSI compares mileages with the instrument cluster ECU and whichever has the higher mileage becomes the default for the other. So the BSI has seen that the donor instrument cluster has a higher mileage and has therefore updated itself to match the mileage. It is to help prevent 'clocking'. Unfortunately in this case, your multifunction screen is part of the instrument cluster and obviously contains the data for the mileage within its ECU. Normally changing a standard MFD would have no impact on this, but yours being installed in the cluster is obviously doing the same job.
The only way you could get this put back is by somebody with specialist equipment. You would normally need some evidence of the original mileage like a recent MOT that has recorded the date and mileage or a servicing invoice etc. I'm not sure the dealers would even be able to do this. Normally when replacing with a new part it would just assume the vehicle mileage as normal, but in your case it has added 60k to the odometer - the donor unit being from a higher mileage vehicle.
These sorts of places can do it:
http://www.midlandmileagecorrection.co.uk