There are different types of pencils. Some are marked with an H (for hard). Some are marked with a B (for black). Some are known as HB pencils (a mix of hard and black) and are good for drawing ...
But while recovery of HRH's HB may take time, is it possible to put a value on the stolen pencil - or is it too hot to handle? If anyone knows, it's Lee Young from the Antiques Roadshow.