Ofgem has chosen Octopus Energy Limited to take on supplying the customers of Iresa, which went out of business last week.
https://www.ofgem.gov.uk/publication...sa-s-customers
Iresa were so bad at customer service that they were blocked from taking on new customers in March (2018).
I had the misfortune to sign up with them in Feb 2017, and after six months it became obvious how poor they were. I bailed out after nine months (Nov 2017).
I had to register a complaint with the energy ombudsman to get a refund of what they owed me at that point.
I did get it eventually, at the end of March this year. Just in time by the look of it.