Grosvenor, the property firm of one of the UK's richest families, owns much of Mayfair and Belgravia. Recently rich Asian buyers have flocked to this area. But Grosvenor, which now has a Â£12bn global portfolio, is doing just the opposite. As this promotional video for Hong Kong developments shows, the firm wants to beef up its presence in Asia. It is in talks to create a $700m investment club. Nick Loup, CEO of Grosvenor Asia Pacific, explains the thinking behind the move.