Trying to change energy supplier is difficult. Some are totally opaque like Octopus.
They cannot give you a quote because I am not yet a customer. I asked I wont be a customer if you cant tell me the tariffs, to decide whether its competitive. Eventually the request was escalated further up the helpdesk and they did manage a quote which was the same as British Gas. The Octopus Intelligent for EV,S was only a penny less than British Gas. It was not worth changing.
But yeah Octopus is totally opaque pricing unless you are a customer already.
I get more info on Octopus rates here, than I do from the company!!
Like everything else, the energy companies are changing the prices all the time. Give it a couple of months and they will be upside down again and not sure which is the cheapest.