Do you know if you can change the marriott card number on an existing booking? I got a very good rate using "Look No Further" guarantee - so cannot simply cancel and rebook.
I used my existing Marriott card number for this booking - but now I have a new one in my wifes name - which will get us 3 times the BA miles...
If I hand over the new card when I arrive - think they will use it if I ask and get me the extra miles (every mile counts).