Are you just coming here as a tourist and/or do you plan on working here? Also where in Austria are you staying as there are a number of free regional advice centres: https://www.britishinaustria.net/faq/where-can-i-obtain-assistance-in-english-about-various-issues-about-living-in-austria/
Maybe the Austrian Embassy in London thinks it’s easier for you to apply for something like a Temporary Residency Permit in Austria. Without more details it’s difficult to say. As a Brit you are allowed 90 days Visa free, but that is Schengen wide! https://www.migration.gv.at/en/types-of-immigration/temporary-residence/
