How to create one time voucher code

This was discussed in this thread on the USA site. I am not sure if the same feature is available in the UK as well:

To create a single use Claim code, the seller should:

1. Go to the Manage Claim Codes page.
2. Select the ‘Create a Promotion’ tab.
3. At Step 3 of the ‘Create a Promotion’ process, the promotion will show a group Claim code.
4. Uncheck “Detail page display text’ since the Claim code is for a single buyer.
5. Once the promotion is created, click on view or modify your promotions and then select “Manage Claim codes”.
6. Enter any name for the Group Name and the number of coupons you wish to create under ‘Quantity’.
7. Click Create.
8. Refresh the page to get an updated status. Once the Claim code is available, it will show as ‘Ready’.
9. Click download to get a zip file containing a text file with the single use Claim codes.

https://sellercentral.amazon.co.uk/gp/help/help.html/?itemID=60961