I'm totally confused about this.
Last night, a message popped up on my phone saying something like 'Book now! Your £50 travel credit is about to expire'. I tried clicking on the credit tab, but nothing happened and it was late so I went to sleep.
Today I managed to find my travel credit page and it says I have £0 credit. What has happened to the £50? Did I receive the notification only minutes or hours before it expired? Is that normal?
I don't remember any previous notifications about this credit and have no idea what it's for, but I'd like to have it back! If, as @Lizzie says, it's supposed to be valid for a year, but has just expired, why is this the first time I've even heard about having the credit?