1 case: 14w * 1h -> 0.014kWh * 40p of total cost. There is nothing complex. 2 case: It's an issue with mAh markings. Battery rated in Wh has same simple math.

1 case: 14w * 1h -> 0.014kWh * 40p of total cost. There is nothing complex. 2 case: It's an issue with mAh markings. Battery rated in Wh has same simple math. There are no consumer issues jot solves. More over additional ~10^3 magnitude is consumer hostile.