Brazil is one of the so-called "fragile five" economies seen as vulnerable to the U.S. Federal Reserve scaling back monetary stimulus, because of its large current account deficit and reliance on outside capital.
The next biggest increases in enquiries came from Argentina, in the midst of a currency crisis, and Ukraine, which is reeling from a wave of political unrest. Enquiries from both countries spiked 67 percent.
Other members of the fragile five group also saw a pickup in internet house hunting in London's plushest neighbourhoods. Enquiries from Indonesia and Turkey, which have both endured weeks of capital flight and falling currencies, rose 10 percent, while South African interest climbed 9 percent and Indian interest was up 3 percent.
(Read more: How fragile are emerging markets?)
London and the top end of its property market is a well established harbour for money fleeing economic and political instability, because of Britain's relative stability and a tax regime that historically goes easy on foreign residents' overseas wealth.
However the issue of foreign property purchases is politically controversial, with many media reports saying expensive houses and apartments are often bought only as investments and are left unoccupied. The Guardian daily reported this week that several mansions on The Bishops Avenue had been left empty and were falling into disrepair.
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