As London Wedding Photographers we cover these locations (partial list):

W postcodes:

W1B - LONDON:
Portland Street, Regent Street, Westminster

W1C - LONDON:
Oxford Street (west), Westminster

W1D - LONDON:
Soho (south east); Chinatown, Soho Square, Westminster

W1F - LONDON:
Soho (north west), Westminster

W1G - LONDON:
Harley Street, Westminster

W1H - LONDON:
Marylebone, Westminster

W1J - LONDON:
Mayfair (south), Piccadilly, Royal Academy, Westminster

W1K - LONDON:
Mayfair (north), Grosvenor Square, Westminster

W1S - LONDON:
Hanover Square, Savile Row, Westminster

W1U - LONDON:
Marylebone, Westminster

W1W - LONDON:
Great Portland Street, Westminster

W3 - LONDON Acton district:
Acton, East Acton, Park Royal, West Acton, Ealing, Brent, Hammersmith and Fulham, Hounslow

W4 - LONDON Chiswick district:
Chiswick, Gunnersbury, Turnham Green, Bedford Park, Hounslow, Ealing

W5 - LONDON Ealing district:
Ealing, Park Royal, Ealing

W6 - LONDON Hammersmith district:
Hammersmith, Ravenscourt Park, Hammersmith and Fulham

W7 - LONDON Hanwell district:
Hanwell, Boston Manor, Ealing, Hounslow

W9 - LONDON Maida Vale district:
Maida Vale, Little Venice (part), Westminster, Camden, Brent, Kensington and Chelsea

W10 - LONDON North Kensington district:
North Kensington, Queens Park, Kensington and Chelsea, Brent, Westminster, Hammersmith and Fulham

W12 - LONDON Shepherds Bush district:
Shepherds Bush, White City, Hammersmith and Fulham

W13 - LONDON West Ealing district:
West Ealing, Ealing