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@stevo_com and @Ordinata are right, it's a hoverfly. I thinks it's Volucella inanis, a large wasp mimic. The larvae feed on wasp grubs and so it's not uncommon in buildings where there may be wasps nests "often being seen on windows" Ball & Morris, 2015, Britain's Hoverflies.
JoePablo
I think this is a European Hornet? On my door window.