I was downgraded on a HKG - ICN leg of my First class journey from JFK-HKG-ICN (stopping over several days in HKG). It was a one way award flight for which I had used BA Executive Club points to redeem for the First ticket; when I checked in I knew they'd changed out the aircraft but went to the First Class check-in at HKG anyway, and after some confusion and no argument on my part they gave me a cash reimbursement of HK$1,500 (a little less than US$200).