We want the characters who make it onto our banknotes to come from different backgrounds and fields. When selecting a new character, we take into account who has featured on notes in the past. This means that our choices can reflect the diversity of UK society.
Of course, banknotes need to be universally accepted. We therefore look for UK characters who are widely admired and who have made an important contribution to our society and culture. We also avoid fictional characters, or people who are still living (except the monarch on the front of the note). Finally, we need to have a suitable portrait of the person which will be easy to recognise.