so are you saying your house is in what was the curtilage of a listed building?As I indicated, our building inot itself listed but is in the curtilage of a grade 2 listed farmhouse - the farm buildings around the courtyard were turned into housing. The insides can be altered but the exteriors supposedly cannot. The 'original' external fabric in this case is what the builder got permission for back in 1992. NYM conservation area planning is also active.
Was your house converted before or after the listing was applied and were those out buildings constructed prior to 1948.
If you are in a conservation area then you will need PP for most external changes. Depending on the answer to the above will depend on whether you would need LBC.
If the farmhouse was listed when your house was created and the building that was converted to your house was built prior to 1948, then LBC would have been needed and your house will essentially be covered by the listing of the main farmhouse. LBC would be needed to alter your property further than that which has already been granted under the original LBC. Depending on the works being carried out PP and BC may also be required.
All of the above would have to be in writing using the prescribed official documents and be open for public scrutiny, there is no such thing as verbal permission, however a planning officer could verbally tell someone that something was PD and didn't require PP.