To be honest it sounds like they're trying to fleece you for some extra money. They are already referring to your incoming supply as 80A (which is wrong) in several places, and still telling you that you need this "adaptive fuse".
Re-reading your posts, it sounds like the DNO is going to fit a 80A fuse. This is my DNO's policy now for residential properties, so that bit isn't unusual.
I would also get a smart meter installed by EON-Next. You will need one if you want to use a smart (changeable) tariff like Octopus Go or Agile down the line. Just had a look at my smart meter and it does say 100A on it as the max voltage, so with an 80A master fuse and 100A smart meter - both of which should be done for free for you - you would not need this "adaptive fuse".
Re-reading your posts, it sounds like the DNO is going to fit a 80A fuse. This is my DNO's policy now for residential properties, so that bit isn't unusual.
I would also get a smart meter installed by EON-Next. You will need one if you want to use a smart (changeable) tariff like Octopus Go or Agile down the line. Just had a look at my smart meter and it does say 100A on it as the max voltage, so with an 80A master fuse and 100A smart meter - both of which should be done for free for you - you would not need this "adaptive fuse".