Oh, I see - so you are "on grid" for electricity, and have indeed had E7? If so, all my previous comments still apply, and I would be surprised if your proposed change (including getting rid of E7) did not result in a a financial benefit.
My village is also 'off grid' for piped gas, but that doesn't stop us villagers having 'wet heating' - using LPG or oil (and, in a few cases, wood or other solid fuel).
Kind Regards, John
Ye plain old E7!
We used to rent a house in the village with LPG - never again it was ****ing extortionate! Looked at oil a couple of years ago but i'd never make it back as its our first house and will likely move next year or two. Bit of discipline with timers and I think we can make electric/wood work fine. Its not a huge house thankfully