Anyone commuting today will have discovered this. However if you’re travelling this morning take heed. There is Southern/Overground confusion on the rails today.
I arrived just catch my 0845 to find it delayed 38 minutes. Most other services cancelled. Walked to the bus stop to catch the 185 (just leaving/annoying) and then rechecked National Rail app. The 0845 was now running three minutes late. Rushed to the station where I was told a number of trains were being re-instated. So if your’re travelling today just check before you go, but it also looks like the timetable is pretty fluid at the moment.