The Oyster online section of the TfL website has been shut since Friday evening for important maintenance. The closure was publicised beforehand, although it didn’t say it would happen before midnight Friday. While the maintenance is fair enough, what has annoyed me is that all the information pages about Oyster have also been taken offline. Surely they could have kept that information live, even if they had to copy it to another address on the main TfL site.
Edit: Madness! Any page on the Oyster website suggests that you can call the Oyster helpline for help, but when you call the helpline it says that it is closed because of 3rd Party maintenance. I wonder how much money BT will make out of that useless piece of advice?