London has a second home tax, https://www.theguardian.com/money/2016/mar/31/stamp-duty-sec... and a luxury home tax https://www.cnbc.com/2014/12/04/luxury-homes-tax.html but they also had to add rules for proving money was not laundered to buy things earlier this year for the UK https://www.usnews.com/news/best-countries/articles/2018-06-... though it sounds like a workaround is to use shell companies in different countries to buy property.