The answer to this is buried in the 3 page long thread about the changes.
Basically no change as the old rate was 35 MR points for each DC point.
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BAorbmi? posted:
BTW, I also found out the following:
BAA Visa card: £1 = 1 destination mile
bmi Classic card: £1 = 1.5 destination miles (3 for bmi transactions)
Amex: 35 MR = 30 destination miles
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Full thread
Cheers
Nick