Very happy with Octopus Energy - yet another £50 referral has arrived (that is, £50 for person who joins, and £50 for me), gone for max green energy plan, but still way cheaper than SSE, and 5* review on Which? for every aspect of service. There are some firms that are slightly cheaper, but have poorer service. Here's the link: https://share.octopus.energy/denim-snow-909