The Blue tits have completed their nest and at least one egg has been laid. However, since yesterday, a wasp has started building a nest on the camera lens. We removed the residue from the lens this morning but it returned to recommence building during the day. The Blue tits also continued to visiting the nest, giving our first glimpse of an egg. After school, we managed to catch and dispose of the wasp. We will have to wait and see whether the Blue tits win the battle and continue to lay their eggs.