Should it be David or Ed?

There is currently no vacancy for leadership of the Labour Party, but the “Guardian” today devotes no less than six full pages of its G2 section to a discussion of who would be the best successor to Gordon Brown when – as widely expected – he leads Labour to defeat at the General Election, probably in four months time. Should it be David Miliband, 45 year old Foreign Secretary, or Ed Miliband, 40 year old Climate Change Secretary?
The Milibands are the first brothers to sit in the cabinet together since Austen and Neville Chamberlain in 1931. However, I’m sure that they will not become the first brothers to contest the same leadership election. It will probably be David – but it’s good that the Labour Party has sufficient talent to have a choice. A real pity though that a change was not made a year ago.