Are you worried? Call the bat phone...

According to the Bat Conservation Trust, the only real health risk from droppings is allergic reactions or dust inhalation if cleaning up very large quantities-which can be easily avoided by basic safety precautions like wearing a dust mask.

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The other concern is rabies, a rare but very dangerous virus that can be caught if an infected animal bites or scratches you. A small number of bats in the UK may carry rabies-like viruses called European Bat Lyssaviruses (EBLV). "EBLV are transmitted by the bite of an infectious bat or by its saliva entering a wound or mucous membrane," the Trust continued. "There is therefore no risk to you if you do not approach or handle a bat. This means that there is no need to be concerned if you have bats roosting in your property or flying in your garden."