This is my sister's house. She was unwell and is now in hospital. The house was left in a bad state, cleaned to some extent but an ants nest has now appeared in the kitchen. Nothing more that I know of.
There is a rodent in a crawl space which has died and is now causing a smell and further vermin now that it is warmer. It is located in a crawl space between the ceiling of the kitchen and under the floor boards of the upstairs bedroom.
The crawl space needs entering and then filling so that it cannot be used. It may involve some work to breakthrough to the crawl space hence may also need a builder.