Poor from start to finish. I was always largely in debit no matter what season; I didn’t accrue enough credit over the summer months to make winter payments more manageable despite paying an additional amount at the end of the Winter season. Just four months after paying this to settle my account, I was over £400 in debit again (this time for the Summer months!?) They provided plenty of jargon to explain and have a very complicated billing system. A means to be dishonest, I’m convinced. After a few years of this, I decided to move to another provider and won’t ever go back!