PDQ, 'semi-detached' usually means that the houses are joined in twos, as opposed to 'terraced' houses which are joined in rows. One party wall instead of two.
Bobert's 'textured' wall has merit. Some years ago I had to noise-suppress an office passage in a noisy factory. I used 4"x2" timber on edge, and it was fairly effective. That is how some firearms silencers are arranged.
In this case the noise was travelling along the passage, as it does in a rifle, though.
Secondhand/used carpet is available in house-lots online quite cheaply and is ALMOST self-supporting when it is standing on end, but I'd say maybe too heavy to stick, or even staple, to a standard ceiling. And especially an old one.
Ventilation might be difficult, too. Hard, painted surfaces bounce sound around instead of absorbing it.

Nah. All too difficult. You would have to effectively build another room inside a room. Do what PDQ said and move.