If your building is more than 1m from the boundary you only need the fire resistance from the inside. The internal plasterboard will take care of this.
Just to clarify the last sentence of my previous post you have no problem with surface spread of flame.
If your new building is within 1m of a boundary then the facing elevation will need 30 minutes fire resistance from both sides. It sounds like this is what the BI is asking for. You have no problem with external fire spread.
Finally a response that suits your needs!
What your neighbors have done is not an eyesore and nor does it really, if you are honest (and I mean really honest), affect you or your property.
The private building control company is not licensed by the council. They are licensed by the government and are in competition with the council.
As with council building control some of them are very good and some rubbish and most are somewhere in between.
Taking on a job that has been...