London is without question the most popular city for investors,” says Gavin Sung of the international property agents Savills. “There is a trust factor. It has a strong government, a great legal system, the currency is relatively safe. It has a really nice lifestyle, there is the West End, diversity of food, it’s multicultural.” We are in his office in a block in the centre of Singapore and he is explaining why people from that city-state are keen to buy residential property in London.