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UK News
Bills for homes using a typical amount of gas and electricity will drop by £11 a month.
The retailer continues to recover from a cyber attack that is expected to hit profits by £300m.
The Nationwide says the fall may reflect weaker demand following April's changes to stamp duty.
Nikita Bier has previously developed platforms that have proved popular with teen users.
Campaigners say the UK's system has been "overlooked for years", and investing in it is a "no-brainer".