Generally speaking pipes and cables are ran vertically from the point the come out of the wall . So if you see a plug socket the cable is either running vertically up from there and into your ceiling or running vertically down into the floor and similarly with pipe work .
Sometimes cables can be run horizontally for ring mains etc etc.
So for rule of thumb don't drill vertically above or below a plug socket or horizontally left or right of the plug socket.
You can buy for a reasonable price a cable/pipe and stud finder
Like most things in life you buy really cheap you'll probably buy twice. I have a Bosch one cost around 40 notes and it works really well.
AND can probably clear this up a little better than myself
in a green and pleasant land
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