Stabbing in the dark

Parking these images here in the hope that come the day I am not randomly stabbing in the dark through plasterboard to locate a fixing in a stud partition in the utility room. The hazards are power cables, drain pipes and hot and cold water supplies, so I don't want to hit them. These are my (badly recorded and liable to some slight misunderstanding) reference points should the dark demon of DIY need to arise within our household and I actually have to do something technical, time will tell.