Esther Heer, RBS Coutts’ former head of north Asia, is widely expected to be joining BSI Asia, according to private bankers and head hunters. One private banker, following a discussion with a BSI counterpart, said that Heer’s move to BSI was a foregone conclusion. “I think it’s firming up,” said a headhunter about Heer’s mooted appointment to BSI, following talks…