Brexit has changed much for them, but less than one might think – at least when it comes to their strategic position at Westminster.
There are now 15 independents, plus the Change UK factions and a smattering of pro-Brexit rebel Labour MPs.
The failure of the SDP by no means proves that a new movement of this kind is doomed to failure.
Ten initial thoughts on today’s announcement by Umunna and his colleagues.
The Leader of the Opposition looked totally incapable of taking over.