On Fri, 26 Mar 2021 11:19:06 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Scott wrote:
Why a monthly direct debit? Mine produces a bill every three months
and collects the sum due by direct debit.

They are effectively giving you credit for more time than monthly. Which
is going to cost you more. I don't think any of the best deals do
quarterly.

I think the counter-argument is that you are paying the correct amount
instead of allowing the supplier to pick a higher amount then refund
you - or not - at the end of the year.