When I enjoyed my compimentary night in December at the MO Hyde Park I booked through CTS simply to ensure no come-backs. CTS say the rules have not changed. Another benefit of the MO Centurion offer is that they confirm the upgrade at time of reservation, you don't have to wait until check-in to see if you've been lucky.
I'm staying there again this weekend but only for one night.
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Bazz
Still Flying