Thank you to all for your advice.
Its ironic isn't it that the installer doing the whole roof conversion needs to follow building regs that covers insulation and heat loss and which is enforced by the council, but the council has no interest in consequential heat losses created for a neighbouring property.
How do I know if a fire stop should have been installed? Is there a building reg that covers older properties?
Here's a photo from inside the loft looking at a section of the party wall between two roof battens. The fabric you can see is overhang from the neighbour's build.
View attachment 178095
I should point out that a roof rafter runs down the top of the party wall (the one mentioned in my previous post where my gutter is meant to be attached). It is between the wall and the battening and covered by the original build cement as shown. As you can see the gutter has been placed OVER the battens and squeezed under the lifted slates - is this right?
Since the gutter is over the party wall and installed without consultation do I have any right to ask them to remove it?
Thanks for the links. Any thoughts about installation method when a rafter runs down the top of the wall?
Thanks again.