Twitter has alerted me to the following;
No service Stratford to Richmond/Clapham Junction and Highbury & Islington to West Croydon/Clapham Junction/Crystal Palace/New Cross due to a shortage of trains caused by extra safety inspections. London Overground tickets will be accepted on London Undergroound, C2C, Southeastern, South Western Railway, Thameslink, Greater Anglia, Southern and local bus services via any reasonable route.
I’m not working today so no idea what’s happening. Highly suggest using other means to travel this morning. Eek!
Edit: Twitter team is now saying no service until at least midday.