You are on monthly Variable Direct Debit then, sounds perfect. Personally I prefer to spread it through the year but not everyone is the same.
Just like in France:
People who refuse the installation of a Linky smart meter at their property in France after January 2023 will face paying an extra €50 per year, it has been confirmed, with up to 3.8 million people affected.
https://www.connexionfrance.com/article/French-news/Millions-who-refuse-Linky-meter-at-France-home-will-have-to-pay-extra
Seems reasonable. If you want an old meter or refuse to change it to a smart meter, you pay a higher standing charge for the "privilege".