Tesco to reduce BA miles

Got a letter from Tesco last night telling me that as of the 1st September the number of miles will be reduced from 600 to 500 per voucher.
Apparently this adjustment is necessary so that everybody can benefit from the double points scheme...
The only thing I acan find online is in their FAQs here
Apparently this adjustment is necessary so that everybody can benefit from the double points scheme...

The only thing I acan find online is in their FAQs here