I'm sure this isn't going to make you feel any better @Davidjlplatt but from the logs I can see that it's only happening to you - no other reports of ID005 from any other devices today.
The reason it should never happen is you've logged in successfully, so system A says "this user is valid and has a subscription". It then passes a token to system B which includes your subscription details ... ID005 occurs when the token doesn't have any subscription in it, so system B doesn't know what to show you.
I'm going to need to raise a support ticket to get someone to trace your account through both systems. This won't be looked at until tomorrow I'm afraid.
If you want to watch BT Sport tonight, I can issue you with a temporary pass. Let me know.
Sorry for the inconvenience ... again!
