Details of my next book, co-authored with Prof Ifan Shepherd, which has been 15 years in gestation, and will be out in early October. It can be obtained from the publisher: The Charles Close Society for the Study of Ordnance Survey Maps.

ONE KINGDOM, 116 COUNTIES AND 17,000 SHEETS. The First Edition Ordnance Survey Six-Inch Map by Ifan D.H. Shepherd and Steve Chilton.

The six-inch map of Ireland was a hugely ambitious project for the Ordnance Survey to undertake in 1824, and as work...