On Fri, 26 Mar 2021 19:58:57 +0000, alan_m
wrote:

On 26/03/2021 19:25, Scott wrote:

In other words, fixed DD benefits the supplier. On top of that, if the
monthly sum is exaggerated the supplier benefits from the account
credit, which AIUI was the point OP was making in the first place. The
concern seems to be that suppliers can benefit by holding the
customer's money. How would you propose to remedy this within the
framework of a fixed DD?

I don't have problems with my DD because the amount taken over the year
closely matches my usage. Even in the year where I reduced my annual
energy consumption the excess was paid back quickly when requested.

When requested ...

Common sense comes into play. If you check your bills and find that the
DD amount taken is excessive just email the company and request that the
amount is reduced.

I would prefer the DD amount to equate to the amount shown on the
bill. When I go to the supermarket I pay for the items in the basket.
I generally prefer that approach to shopping.