As it also covers south west and west London, I think previous posts aren't ambitious enough. How about EllSellWellNell? No? At least it would be consistent, which is more than TfL can manage.
Time for a rant. TFL text alerts are a great idea but...they don't realise the Overground has happened. When you try to set up alerts, it appears the East London line is all there is. Oh, and (sorry!) Forest Hill doesn't exist at all. When changing to Hammersmith and City line recently, I even heard an announcer refer repeatedly to East London Line delays. Perhaps delays are still going on, despite ELL having closed years ago, and there's a haunted train stuck in a siding near New Cross, full of zombie commuters waiting for signal upgrades.
And finally...what's the point of telling us there are "delays on the Overground" when it's affecting Richmond, Imperial Wharf etc. Perhaps Ken or Boris could edge the election by promising to rename our branch the Forest Hill Line...