It's actually pretty easy to spot your up-and-coming leaders. You don't need a complex assessment centre, just good observation skills. Notice those who:
1. are on time every time and never blame the traffic nor the weather nor their baby.
2. have a note-pad with them at all times.
3. ask great clarification questions.
4. dress as they wish to be perceived not what they can get away with.
5. are loyal to customers and colleagues (never mind king and country).
6. have time and respect for support staff.
7. deliver to promises.
8. invest in relationships.
9. have always got a leadership book on the go.
10. realise they can lead even though nobody has given them the job title nor grade nor salary nor car (yet).