Can the same person be referred twice?

Referral schemes are retailer specific - this means you cannot refer someone at the same retailer multiple times. However, a person can be referred multiple times with the same Caffe Nero account

In short, this means that you can refer friends at several retailers within the Neal Street Rewards app or you can refer friends to another Neal Street Tech-powered app

Note that Neal Street Tech powers the Caffè Nero app.