Property Development Companies What Is The Name Of Gerald Grosvenor's, The 6th Duke Of Westminster, Property Development Company?

What is the name of Gerald Grosvenor's, the 6th Duke of Westminster, Property Development Company? - property development companies

Gerald Cavendish Grosvenor, 6th Duke of Westminster, one of the largest landowners in Britain and one of the richest real estate developer in the UK. What is the name of the firm or company through which it operates?