Ms Aoife MacEvilly:

When people refer to the best tariff, they are usually talking about the deepest discount available for switching customers and customers who sign up for particular packages and years. If everybody is switched to those packages, the money available from the supplier to support the discounts has to be spread over a larger pool of people. In any given year, a supplier will offer discounts to attract new customers. Those discounts are paid for by the supplier. It those discounts are allocated across the entire set of customers, those discounts will automatically be at a lower level for the entire-----