E85 - binnacle mileage change

I've just had a faulty binnacle replaced on my E85 from a donor car. The car's now running beautifully BUT mileage is obviously showing incorrectly (74000 instead of 15000). I still have the old binnacle and the mechanic told me it can be corrected. Any pointers towards someone in Cheshire or Lancashire that could do that for me please?
 
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