What a joy it is to listen to people who not only know their subject, but know how to put it across to the rest of us. I’ve just been listening to Greg Woolf, David Breeze and Lindsay Allason-Jones talking to Melvyn Bragg about  Hadrian’s Wall. It was the final edition in this series of ‘In Our Time’ and will be repeated at 9.30 this evening on BBC Radio 4.

It’ll be available as a podcast later and there’s also a useful reading list on the web page for those of us who like to grovel around in the detail.