Yesterday my parents discovered these 'things' attached to the varnished wooden fascia board outside the downstairs bathroom. They are attached to the outside of the house, in a sheltered spot. They live in Somerset, UK.
They are approximately 6 cm in length/diameter (some are round and some not - see photos), and have been there for about a week (it is about a week since this part of the house was looked at).
My questions are: 1) What are they? Mould? Fungus? Insect? 2) Is it damaging the wood, and therefore should it be removed?