The speaker is a well known historian and he said exactly the right thing:
The only thing that encourages me to open my mouth, other than the pleasure of being on record as a Marshall Lecturer, is the feeling that, in the present state of your subject, economists may be prepared to listen to lay observations, on the ground that they cannot be less relevant to the present situation of the world than some of what they write themselves. Especially, one hopes, they may listen to a layman who appeals for a greater integration, or rather reintegration, of history into economics.
But Eric Hobsbawm said this in the 1980 Marshall lecture - I guess some progress has been made.