Postcodes can be a mixture of EO and cabinet based and your postcode is one of those.
So the fact those on cabinet 21 now have FTTC is because that cab got its fibre twin, not that they were previously EO based and have gained a new cabinet.
In terms of ETA not aware of any plans, it will depend on what goals the Derbyshire BDUK project are working to and a bit of luck. The Derbyshire people are the ones to pester to ensure that your plight is recognised.
If you don't know where cab 21 is and has been for years it is at