Jeremy Bamber, who murdered five of his family members, and two other killers were told their whole-life tariffs amounted to a breach of human rights.
The European Court of Human Rights said whole-life sentences were "inhuman and degrading".
ITV News deputy political editor Chris Ship reports:
More top news
The PM will demand faster action from Google, Facebook and Twitter as world leaders set them a deadline and warn of fines for inaction.
Boris Johnson's failed coup achieves what the Prime Minister could not do her for herself - he has strengthened her position.
Wet and windy weather spreading across northern and some western parts, with some heavy rain likely across Northern Ireland and Scotland.