Mice are frequent visitors to the home. They can sometimes be heard scuttling about the loft and droppings smilar to small lengths of thin pencil lead are seen in cupboards and on surfaces. Should heavier noises be heard in the loft then rats or squirrels should be suspected. Any noises in the loft should be investigated immediately as rodents and squirrels can do an enormous ammount of damage to wiring and plastic pipes. Flood or fire could be the result.
Mice are easily dealt with by use of traps or bait and it may not be all that expensive. Typically this work will cost around £75 to £95 depending on the severity of the infestation.