OK what if the neighbour placed a free standing shed, right up against the flue.
1. The boiler would keep cutting out.
2. Eventually someone would spot the shed.
3. The boiler gets cut-off and labelled.
4. Your parents have no heating/hot water.
5. Your parents would have to finance alterations.
6. The free standing shed stays where it is.
Unable to comment on the wall, don't know if its a party/boundary wall, thats what the solicitors are trying to find out.
So its ok for you to shove a 4/5" flue terminal out of wall and discharge fumes into neighbours property but he can't put a few 2"/10 screws into the wall.
Ok going with your theory if the shed was fee standing then they would have changed the boiler, end of story !!
