Become Diamond Elite until 31 December 2022 (and extend this status until the end of 2023 by staying at least 10 nights before 31 December 2022): - If you're not yet an IHG One Rewards member, register first. - Go to: https://www.ihg.com/rewardsclub/gb/en/offers/promoreg/ - Fill in your email address or member number. - Enter the following promotion code: 70027 - Click on "Register Now".