Though I was raptly absorbed throughout by this superb stage version of Pat Barker’s award-winning First World War novel (cannily adapted by Nicholas Wright and powerfully directed by Simon Godwin) I found myself unable to sit still and kept shifting position in my seat, when not half-jumping out of it (and not just at the horrific and heartbreaking mental regressions to the trenches and ghostly revenants).

And that’s because, even more so than when you read the book (a work of genius, in my view), the material – presented through the physical immediacy of theatre – seems to get through to your neurological (as well as emotional, psychological and intellectual) depths.