the sound of small feet in the attic

i don't think you should be trying to deal with this yourselves.
handling poisons etc has many hazards.
get an expert in.
pest controller. they are very good.

From the title of this post I thought you were going to tell us a ghost story...

When you say the plug-in what do you mean? We have an electronic devise in the loft that sends out a noise in a frequency only heard by animals. It seems to do the trick.

Do you know what is attracting them?

We had a lot more problems when we kept geese than we have now because there was always some food about for the pests.

The Big Cheese, small blocks of poison, open the loft and throw them in, the little corpses then mummify.........apparently.
We had our roof cleaned of moss and lichen last Summer, whilst they were on the roof the roofers re cemented our ridge tiles and fixed a couple of loose ones,
This Winter, no mice yaaay.

DH used some humane traps when we lived in the country everyone did otherwise we would have been overrun. The 'stuff' came with it bought from local hardware store.