I fixed our prices again with Octopus in September, before our old fix expired.
We are in credit, and the fix means that, given our historic consumption over a year, our monthly payment will more than suffice to cover any likely bills, even if we have a very harsh winter.
Indeed, next year, we may take some of the account credit and have a break somewhere.
I have found Octopus pretty good to deal with since switching from OVO.