@sircerebus666 thanks for the reply. The neighbour advocating it is actually due to complete their loft conversion before us. They have had a lot of difficulty figuring out a design with their neighbour on the other side (who build a loft extension right up to, but not using, the party wall)...
We are planning a loft conversion with a full width rear dormer, which is very common in our area. We've had mixed views about how to deal with the party wall and so I'm seeking some wisdom.
The first option is to build inside the boundary with a typical dormer with a timber frame. All the loft...