access:There is a catch to edf v5 which relates to it and the standard tariff but unlike financial institutions the catch is clearly stated on its website.
There is a Which? revelation today that power companies can raise tariffs for 2 months before informing their customers.
Also stated is "it is also concerned that customers who switch supplier are not given a guarantee that the tariff they want will last for more than a day or a week."
EDF V5, Scottish Power Online Saver 7 and no doubt others are technically vulnerable to this becasue the initial discount is significantly greater than the guaranteed minimum discount.
Could that even be a double whammy?