I put in my soon to be postcode which is not rural and quite a few were 10mb. Think I’ll go Vodafone.
Sorry to tell your Granny how to suck eggs, but as you already know where you are moving to, see if you can join the local Facebook or 'Nextdoor' apps and you can get an idea of how good Vodafone would be in that area. You'll have to tolerate a load of people moaning about every little thing, but I guess it's no different to coming onto this site daily, arf!