This is the Common Garden spider, Araneus diadematus - in fact a 'deflated' female, having laid her eggs.
Females are at their largest at this time of the year and large females, like this one, make their webs in ridiculous places, over doorways and in front of windows. They can be brought indoors on our clothing when we unwittingly walk through their webs or on walking brought in off a line.
Eggs are laid about now in a yellowish silken sack and the female protects these for as long as she is able. Sadly she succumbs to the cold if winter and paucity of insect prey. The eggs are the surviving generation and hatch next spring.
It is a harmless and beautiful spider - but best off outside.
Sorry I'm new and can't work out how to post but it will let me reply to threads. Does anyone know what this is??
Yours is the Missing Sector Orb Web spider, Zygiella x-notata. This is a very common and widespread species and loves to make its web over windows and uses the corners if the frame and the sill for its refuge. I doubt there is a home in the land that does not have this species in residence.
It is also the species most commonly mistaken for the Noble False Widow, Steatoda nobilis.
Zygiella spp. are completely harmless and through the year they will catch a good deal of insects and other invertebrates that are considered pests. They are also one of the few species that happily feed through the winter given available winter insects.
Thank you very much....I shall leave him be :)
Thank you SO much, I love this website and will now spread the word