- M W H
- A W A
- A W E (Anderson Water Equipment) Ltd
- A W Auto Services
- H W Bruton & Sons Ltd
- H W Bruton & Sons Ltd
- H W Bruton & Sons Ltd
- H W Bruton & Sons Ltd
- J W Civils
- J W Collins & Son
- L W H Construction
- W W F (Cymru)
- E W Davies
- E W Davies
- J W Dorgan
- G W Edwards (Pharmacy) Ltd
- B & W Electrical
- G W Electrical
- J W Engineering & Machining Services
- A W Engineering (UK) Ltd
- K W Evan
- R W Evans
- R W Fowler
- D W Giblette
- R W Gregory Llp
- R W Hancock
- S W Heating Equipment Ltd
- D W J Heating Ltd
- J W Jones
- R W Learning Ltd
- I W Lloyd
- I W Lloyd
- D W D Ltd
- R W A Ltd
- M & W Mack
- L W T Marketing Services Ltd
- D W Matthews
- D W Morgan & Sons
- E W Office Systems
- D W Parker House & Garden Maintenance
- A W Peckham
- T W Roberts & Son
- R W Seaman
- S W Spiller
- G W Taxi Meter Services
- J W Todd & Son
- A W G Warren & Son
- M W Watson
- Wales Co-operative Centre
- Wales Council For The Blind
- Wales Council For Voluntary Action
- Wales Digital College
- Wales Disabled Drivers Assessment Info Centres
- Wales Euro Information Centre
- Wales Fluid Power Ltd
- Wales Fund Managers
- Wales In Action & Action Network
- Wales International Freight
- Wales Management Council
- Wales News Service
- Wales On Sunday
- Wales Pre-School Playgroup Association
- Wales Tourism Alliance
- Wales Training Services
- Wales & West Housing Association Ltd
- Wales & West Housing Association Ltd
- Wales & West Housing Association Ltd
- Wales & West Kitchens
- WalesTrade (International)
- Walk Free
- Walkabout Inn
- Walker House
- Walkers Snack Services
- 4 Wall 4 Rent
- Wall Tie Centre
- Wallace Arnold Travel Shop
- Wallace Williams Austin Ltd
- Wallich-Clifford Community
- Wallis Fashion Group Ltd
- Wallis Fashion Group Ltd
- Wallpaper World
- Wallpaper World Ltd
- 4 Walls 4 Sale
- Wallys
- Walsh Demolition
- Walston Castle Beefeater & Travel Inn
- Walthams & Jonathan David
- Walton's
- Walton
- Waltons Coaches
- Wardell Armstrong
- Warehouse
- J Warren Hailes
- Warwick Confectionery Co
- Warwick Emanuel P R Ltd
- Wash & Go
- Washington Design Co
- Wasp IT
- Waste Reduction Services
- Watches Of Switzerland Ltd
- Water Development Services
- Waterfront Outdoor Venture Gear
- Waterhall Youth Centre
- Waterloo Gardens Post Office
- Waterman Burrow Crocker Ltd
- Waterstones Booksellers Ltd
- Waterstones Booksellers Ltd
- Watervoice Wales
- Wates Construction
- Watkin Davies Financial Services Ltd
- Watkin Davies Ltd
- M Watson
- Watts Coaches
- Watts Gregory
- Wavelength Unisex Salon
- Way A Head
- Wayleaves.Com Ltd
- Wayleaves Ltd
- Wayne Ponchaud
- Wayne Price
- Wayside Boarding Cattery
- WD Rees Steeplejacks Ltd
- Web Computer Supplies
- Web Travel Services
- Webbs Landscapes
- Webvibe
- Weddel Swift Distribution Ltd
- Weeks Wholesale Meat Co Ltd
- WEIC Ltd
- Wel-Care Mother & Baby Hostel
- Wellfield Bookshop
- Wellfield Court Gallery
- Wellfield Osteopathic Clinic
- Wellfields
- Welsh Academy - Academi Gymreig
- Welsh Auto Parts
- Welsh Badminton Union
- Welsh Cancer Intelligence & Surveillance Unit
- Welsh Cash & Carry
- Welsh Centre For International Affairs
- Welsh Centre For Learning Disabilities
- Welsh Coast Windows Ltd
- Welsh Consumer Council
- Welsh Cycling Union
- Welsh Federation Of Housing Associations
- Welsh Gymnastics Ltd
- Welsh Joint Education Committee
- Welsh Language Board
- Welsh Language Teaching Centre
- Welsh Local Government Association
- Welsh Music Foundation
- Welsh National Opera
- Welsh Netball Association
- Welsh Rugby Union Merchandise
- Welsh Rugby Union Travel Services
- Welsh Tartan Centre
- Welsh Weight Training Association
- Welsh Womens Aid
- Wendy's
- Wendy Griffiths
- Wendy Hopkins & Co
- Wentloog Boarding Kennels & Cattery
- Wentloog Security Ltd
- Wentworth Lodge
- Wenvoe
- Wenvoe Arms
- Wenvoe Castle Golf Club
- Wenvoe Community Council
- Wenvoe Heating
- Wenvoe Library
- Wenvoe Sand & Gravel
- Wesley Cowbridge Road Methodist Church
- Wessex Garages
- West Bromwich Building Society
- West End Blinds Co
- West End Social Club
- West Link Plumbing
- West One Express Ltd
- West 'N' Welsh Glass Ltd
- West1 Express
- Westcott Roofing Services
- Westdale Press Ltd
- Western Auctions Ltd
- Western Automation
- Western Cork Ltd
- Western Heating & Plumbing
- Western Leisure Centre
- Western Mail
- Western Mail & Echo Ltd
- Western Mail & Echo Ltd
- Western Permanent Property Management Co
- Western Postal Delivery Office
- Western Security Systems Ltd
- Westgate Hotel
- Westgate Sports Agency
- Westgate Travel
- J Westlake
- Westley Of Cardiff
- Weston Decorating Specialists
- Weston Electrical
- Weston Financial Group
- Weston Spirit
- Westward Plastics
- Westway Surgery
- Westworld Retail Corp
- WET Mechanical Services
- A Whatley
- Wheadon's Group Travel Ltd
- Wheatley Road Sheltered Housing
- Wheeler & Price
- Wheels Auto Services
- Whispers
- Whitbread Walker Ltd
- Whitchurch Adult Education Centre
- Whitchurch Books Ltd
- Whitchurch Builders & Decorators Supplies Ltd
- Whitchurch Computers
- Whitchurch Computers Communications
- Whitchurch Golf Club
- Whitchurch Golf Club
- Whitchurch Health Foods
- Whitchurch High School Lower & Upper
- Whitchurch Hospital
- Whitchurch Library
- Whitchurch Methodist Church
- Whitchurch MOT & Service Centre
- Whitchurch Road Bakery
- Whitchurch Road Post Office
- Whitchurch Rugby Football Club
- Whitchurch Studios
- Whitchurch Tennis Club
- Whitchurch Tyres
- Whitchurch Village Practice
- Whitchurch Windows
- Whitchurch Youth Centre
- White Consultants
- White Dove
- White Dove Service Station
- White Hart Hotel
- White Lodge Home For The Elderly
- White Motors Ltd
- White Young Green
- Whitehall Cleaning Services
- Whittard Of Chelsea
- Wholesale Fruit Centre (Cardiff) Ltd
- Wickes Building Supplies Ltd
- Widelode
- Wigley Johns
- Wigwam Activity Toy Centre
- Wild Things
- A Wilde
- Wildlife Trust (Wales)
- Wilford Dance Studio
- Will Maton
- William Bradley & Wallis
- William R De Lloyd & Co
- William A Gill
- William Jones Packaging
- William Pitt
- William Saunders Partnership
- William Shapland
- William Thomas
- William Trezise
- R Williams
- E Williams
- B Williams
- Williams Associates
- F Williams Distribution Ltd
- Williams House & Garden
- Williams Ross
- Willis Construction Ltd
- Willis Enterprises
- Willis Ltd
- Willis Systems Ltd
- Willow Intruda Security Services
- Willowbrook Primary School
- Willows High School
- Willows High Shool
- M Wills-Wood
- H Wills-Wood
- Wilprint Group Ltd
- Wilson Road Sub Post Office
- Wilson Weddings & Chauffeur Services Ltd
- Wilson & Wilson
- Wilts Wholesale Electrical Co Ltd
- Window Build
- Window Class
- Window Fitters Mate Ltd
- Window World (Wales) Ltd
- 4 Winds Association
- Windsor Clive County Infant School
- Windsor Clive Junior School
- Windsor QuayTennents Association
- Windway Tyre & Exhaust
- Wine Rack
- Wine Rack
- Wineland
- Wines Galore Off Licence
- Wing West Ltd
- Winterson Richards Ltd
- Winwood Products
- Wisepenny Products Ltd
- Wishes
- Wishful Thinking
- Witchell Associates
- Witness Service
- Women Connect First
- Womens Arts Association
- Wonderwomen
- M Wood
- Wood & Wood
- Woodcroft
- Woodcroft Centre For Adult Services
- Wooden Wood
- Wooden Wood
- Woodhead R S R Ltd
- Woodies
- Woodies Emporium
- Woodlands High School
- Woodlands Medical Centre
- Woodlands Nursing Home
- H Woodley & Co Ltd
- H Woodley & Co Ltd
- Woods Brasserie
- Woods Electromech Ltd
- Woodstock Interiors 2000
- Woodville Metals Ltd
- Woolwich PLC
- Woolworths PLC
- Woolworths PLC
- Woolworths PLC
- Woolworths PLC
- Worcester Court
- Words Apart
- Work 121 Recruitment Ltd
- Workers Educational Association
- Workers Educational Association (South Wales)
- Working Word PR Ltd
- Workplayce Ltd
- World Links
- World Of Water
- World Wide Webb Technologies Ltd
- Worley's Hardware
- Wright Glass
- Wrought Iron Centre
- WW Building Services
- Www.Bootz.Co.Uk
- Wyatt Graphics
- Wychwood Furniture Co
- Wyevale Garden Centres PLC
- Wyeverne Electrical
- Wyko Ltd
- Wyn Thomas Gordon Lewis Ltd
- Wyndcliff Marketing
- Wyndham Street Day Centre
- Wynford Hotel
- Wynne Jones Laine & James
- Wynne Motor