ScottishPower is giving customers an “unlimited” discount of up to £120 off energy bills as part of a rewards scheme.

The energy supplier, which serves around five million households and businesses in the UK, is giving away the freebie every time a customer refers a friend.

Customers simply need to share a unique referral link with their friends or family, and every time someone uses the link to sign up to ScottishPower, you will both share £120 worth of credit.

It means that you and your…