bmi diamond club - how to retrieve DC card number?

Thnaks to my fine UA friends not crediting miles to MP for BD flights, I thought I might as well put them on my old DC card. However, like an intelligent soul, I have lost it and so don't know the number. How can I retrieve this? Unlike a lot of airline websites, the BD one will only e-mail a new password, rather than your number.

Any ideas on how to get the number? Is there an address to e-mail BD to ask for a new card?

thanks

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