Don't assume old terrace/semi with solid walls means good insulation, like I mentioned above, my old victorian semi with solid walls was a nightmare, I could hear what they were watching on TV and all sorts of stuff, toilets flushing, bedroom stuff, kettle boiling the whole lot.
Agreed my dad's house (semi) is about 120 years old and when sat in the kitchen you can hear muffled conversations from next door.
Also several dogs that live outside and like barking at everything. Oh well!