If you are seeing the screen below, the link you are accessing has either expired, or already been redeemed.
Please log in again by pressing Login here to access your account.
Gmail
If you have a Gmail email address, it may be that Gmail is grouping the login links together in a chain, which means you are opening already expired login links.
If you are opening new emails and the link you click is already expired, disable Conversation view within Gmail.
Step 1
Open Gmail, if the login links display together, conversation view is on.
Select the menu.
Step 2
Click Settings.
Step 3
Choose Inbox customisations.
Step 4
Toggle Conversation view to off.
Step 5
Once done, the emails will automatically be displayed individually, meaning you will open the newest one every time.