John and Tabitha Terence-Jones have lived in Singapore for eight years. But, while the couple rent their Asian home,back in Britain, their property portfolio is booming. The pair, who work in insurance and HR respectively, initially decided to let out their home in Wandsworth, southwest London, while they were away. After fees, it brought in £1,500 a month, in addition to the £1,100 they were making on a one-bedroom flat in Balham they ...