Silverfish are found in fairly moist areas: kitchens, larders and mainly in bathrooms and basements. They can also be found in books and paper, slightly damp cupboards, behind skirtings and loose wallpaper. The silverfish feeds mainly on small food particles and the paste on the back of wallpaper that has become detached. It attacks gums and glues of bookbinding, feeds on fragments of dead insects and may also eat textiles such as cotton and linen. When only a few silverfish are seen it is not necessary to take any action other than checking for damp and possibly removing their food source.
If large numbers of these insects trouble you they are easily controlled with normal insecticidal spray or dust which can be bought from most hardware stores. Look for the products that are specifically designed to deal with crawling insects. The presence of silver fish is an indication of damp conditions. This may be a warning that repairs are needed. Look at the floor, walls and ceiling for signs of staining due to dampness. Check that all the water pipes, gutters and damp proof courses are intact.
Another common problem is condensation ' sometimes caused by drying washing indoors (especially by an unventilated tumble drier) or by cooking.
Most local authorities in the UK will have fact sheets available on pest control, some specifically on silverfish. Phone your local council or town hall.