This article is very interesting, especially the last bit where Look After My Bills is compared to Flipper and Labrador. Flipper being the only one that compares the entire market because it doesn’t rely on the energy company paying them a commission. Yes there is an annual fee to the customer of £25, but at least it looks at the whole market. And also crucially allows other payment methods apart from DD...well that’s what it says on this, albeit partial link anyway...
thisismoney.co.uk/money/bills/article-6084119/The-Dragons-backed-new-energy-switching-firm-you
Oh, as a new forum user I can’t post links

...so here’s copy and paste instead...
“There are other online switching services available, too, such as Flipper and Labrador, which claim they can save you £385 and £537 a year respectively.
Unlike Look After My Bills, which will only switch you when your fixed deal has expired, these firms promise to never stop searching for a cheaper deal. If they work out that you may save even after paying an exit fee, they will switch your account.
Labrador says it won't move you unless it makes you a minimum saving of £80 a year after exit fees.
Flipper says it will not switch you unless it can guarantee a saving of at least £50 a year.
However, Flipper also charges a £25 annual fee. This is because, unlike Look After My Bills and Labrador, which take a commission from suppliers, it does not take money from providers for referrals.
Customers who sign up for Flipper and Labrador do not have to pay their bills by direct debit — although many suppliers offer a discount if you do pay this way.
Flipper will compare deals from any firm that offers an online tariff. Labrador provides a list of the energy suppliers it works with on its website, which it says covers almost 80 per cent of the market.”
There is something about a “free” service that I always find suspicious.