In an era of billion-person countries and trillion-pound economies, we need to find ways to amplify our voice. We are most likely to be heard when the Chinese negotiate with a £10 trillion E.U., not a £1.5 trillion Britain.

For me, fiscal realism is not a betrayal of Labour values; it is the foundation by which we win the trust of the public.

In an era of billion-person countries and trillion-pound economies, we need to find ways to amplify our voice. We are most likely to be heard when the Chinese negotiate with a £10 trillion E.U., not a £1.5 trillion Britain.

It is already clear that, because of advances in technology, drones are going to play an increased role in warfare in the years ahead. It is therefore vital that the legal frameworks governing their use are robust and internationally recognised.

Too often, the idea seemed to be that the cost of being part of Europe was being less like Britain. So after years of fighting to defend Europe against attacks from the Eurosceptic right, it would be fatal to retreat into the same arguments and begin the battle anew.

It was here in Edinburgh that in the 1980s I joined with many others to protest against Margaret Thatcher as she arrived to address the General Assembly of the Church of Scotland.

Historically, Labour has used technology as a form of control. We would use pagers and faxes to send out messages telling people what line to take. The key learning from the Obama campaign is to use technology to empower your supporters.