It seems Peter Kay is to blame.
The following O2 coverage checker page will give an update on the issues.
(Three mobile are also having the same problem https://twitter.com/ThreeUK/ )
Notwithstanding the fact that the priority app has seemingly been down all day preventing customers from buying Peter Kay tickets, I wasn’t even aware that there was this priority sale.
Where was this advertised? Were customers emailed?
I’m on the top package including O2 mobile and heard absolutely nothing.