Tony, would you be bothered if there was a genuine risk that the development might knock a several thousand £ off the value of your house? I'm not against dormers per se, but the line has to be drawn somewhere, doesn't it?Wait till Tony has one next door or close to his property or maybe a mud hut in the garden. Or a basement that undermines his foundations. What will he do? knock and ask politely "would you please stop that" No he would report them, as anybody else would.
Regards
I would only complain if;
any work compromised the structure of my property;
any work presented a real fire risk;
any work came physically over the boundary.
Aside from that, I'm not bothered about visual things.