I'm already paying £200 a month on Octopus, on a mid-2021 fix. This for a tiny 2-bed cottage (though it's electric-only, with no wet heating). I'm anticipating £600 a month or more when the time comes to face the reality of 2023 prices (fixed till May 2023). As the house is listed, I have been refused permission to install PV panels (even in the garden), double glazing, or any kind of visible enhancement to insulation.