| Willows Residential Care Ltd t/a The Brambles Care Home | Stourbridge | A rating |
| Wills & Masson Partnership | Ardglass | A rating |
| Wills Bros Civil Engineering Ltd | Motherwell | A rating |
| Wills Enterprises limited | AYRSHIRE | A rating |
| Wills Fish & Grill Limited TA Will's Fish & Grill | Rochester | A rating |
| Wills Security Ltd | Reading | A rating |
| WILLSTAC HEALTHCARE LIMITED | Scotland | A rating |
| Wilmer Cutler Pickering Hale and Dorr LLP (trading as WilmerHale) | London | A rating |
| WILMER HOUSE LTD | EASTLEIGH | A rating |
| Wilmington PLC | Birmingham | A rating |
| Wilmington Shared Services Limited | Birmingham | A rating |
| Wilmington Trust SP Services (London) Limited | London | A rating |
| Wilmslow Catering Ltd | Wilmslow | A rating |
| Wilmslow Manor Care Centre | London | A rating |
| WILMSLOW PHONES LTD | Wilmslow | A rating |
| Wilmslow Ventures Ltd | Wilmslow | A rating |
| Wilnecote Rest Home | Tamworth | A rating |
| Wiloks African Village Ltd | Nottingham | A rating |
| WILOR LTD | Romford | A rating |
| Wiloth Limited | Dagenham | A rating |
| Wilsden Medical Practice | Bradford | A rating |
| Wilshire Healthcare Ltd | Liverpool | A rating |
| Wilson & Co Accountancy Limited | London | A rating |
| Wilson Architectural Engineering Ltd | Orpington | A rating |
| Wilson Barca LLP | London | A rating |
| WILSON BEDS LTD | Tingley | A rating |
| Wilson Benesch Limited | Sheffield | A rating |
| Wilson Care Resources Ltd | Birmingham | A rating |
| Wilson Cunning Ltd T/A R C Cunning | Bradford on Avon | A rating |
| Wilson Elser Limited | London | A rating |
| Wilson George Group Limited | Cheshire | A rating |
| Wilson Gray Consulting Ltd | Prestwick Park | A rating |
| Wilson Gunn LLP | Manchester | A rating |
| Wilson House Dental Practice | Milton Keynes | A rating |
| Wilson James Ltd | WESTCLIFF-ON-SEA | A rating |
| Wilson Leitch LLP | Glasgow | A rating |
| Wilson Lodgings Limited | Maidenhead | A rating |
| Wilson Partners Limited | Maidenhead | A rating |
| WILSON POWER SOLUTIONS LIMITED | LEEDS | A rating |
| Wilson Retail Scarborough Ltd | Scarborough | A rating |
| Wilson Sonsini Goodrich & Rosati (UK) LLP | London | A rating |
| Wilson Tool International (Europe) Ltd | Swindon | A rating |
| Wilson Vale Catering Management Limited | Ashby de la Zouch | A rating |
| Wilson's School | Wallington | A rating |
| WILSONS SOLICITORS (UK) LIMITED | BARKING | A rating |
| Wilton Bradley Ltd | Newton Abbot | A rating |
| Wilton Crescent Management Limited | London | A rating |
| WILTON GREEN LIMITED | London | A rating |
| Wilton Group Limited | London | A rating |
| WILTON HALL LTD | Bletchley, | A rating |
| Wilton House Ltd | Hemel Hempstead | A rating |
| Wilton Rest Homes LTD | Bishops Stortford | A rating |
| Wilton's Music Hall | London | A rating |
| Wiltshire Aircraft Maintenance Ltd | Winchester | A rating |
| Wiltshire College & University Centre | Salisbury | A rating |
| Wiltshire Council | Trowbridge | A rating |
| Wiltshire Creative | Salisbury | A rating |
| Wiltshire Distilling Company Ltd | SALISBURY | A rating |
| Wiltshire Hotel and Golf Limited | Swindon | A rating |
| WIM Consulting Limited | London | A rating |
| WIM Technologies | London | A rating |
| WIMAX LTD | Romford | A rating |
| Wimbart Limited | Bedford | A rating |
| Wimberly Allison Tong & Goo (UK) Ltd | London | A rating |
| Wimbledon and District Synagogue | London | A rating |
| WIMBLEDON AUTOCENTRE LIMITED | London | A rating |
| Wimbledon Broadway Specsavers Ltd | Wimbledon | A rating |
| Wimbledon Capital Management Limited | London | A rating |
| WIMBLEDON CHASE GATEWAY LTD | London | A rating |
| wimbledon clinic | wimbledon | A rating |
| Wimbledon College | London | A rating |
| Wimbledon Cricket Club | London | A rating |
| Wimbledon Dental Practice | London | A rating |
| Wimbledon High School | London | A rating |
| Wimbledon Park Montessori School | London | A rating |
| Wimbledon Solicitors | London | A rating |
| Wimbledon Village Surgery | London | A rating |
| Wimblington Convenience Store Ltd T/A Premier & Post Office | March | A rating |
| Wimborne Nursing Agency Limited | Dorset | A rating |
| Wimmer Financial LLP | London | A rating |
| Wimpole Aesthetic Centre | London | A rating |
| Wims Limited t/a Wessex Group | Winchester | A rating |
| Wimshurst Pelleriti Limited | London | A rating |
| Win & Win Convenience Store | Manchester | A rating |
| WIN BROTHERS LIMITED | Nottingham | A rating |
| Win Healthcare Limited | Telford | A rating |
| WIN-DOORS INT LTD | SOUTHALL | A rating |
| WINATUTORS LTD | Kent | A rating |
| Winbro Group Technologies | Shepshed | A rating |
| Wincanton Creative Print Ltd | Wincanton | A rating |
| Wincent Services (UK) Limited | London | A rating |
| Winch Design Limited | London | A rating |
| Winch Lane GP Surgery | Haverfordwest | A rating |
| Winchcombe Restaurant Food of India LTD t/a Winchcombe Restaurant Food of India | Cheltenham | A rating |
| Winchester College | Winchester | A rating |
| Winchester House Dental Practice | Narberth | A rating |
| Winchester House School Trust Ltd | Brackley | A rating |
| Winchester Procurement Limited | Winchester | A rating |
| Winchester Steaks Ltd | Winchester, | A rating |
| WInchmore Hill Practice | London | A rating |
| Winchmore School | London | A rating |
| Winckworth Sherwood LLP | London | A rating |
| Wincraft Music Ltd | Cheltenham | A rating |
| Wind 2 Limited | Mold | A rating |
| WIND ENGINEERING & CONSULTANCY LTD | LONDON | A rating |
| WIND FINANCIAL INFORMATION UK LTD | LONDON | A rating |
| Wind River UK Limited | Swindon | A rating |
| Windcave Limited | London | A rating |
| WINDCREST LIFTBITS LIMITED | Wembley | A rating |
| Winder Power Ltd | Leeds | A rating |
| WINDER TAYLOR SMITH | BOLTON | A rating |
| Windermere Control Systems Limited | Ascot | A rating |
| Windermere Educational Trust Limited | WINDERMERE | A rating |
| WINDERMERE EXCLUSIVE LIMITED | Manchester | A rating |
| WINDERMERE HEALTH CENTRE PHARMACY LIMITED | Nelson | A rating |
| Windermere Rest Home | Southend-on-sea | A rating |
| Windermere School | Windermere | A rating |
| WINDEY EUROPEAN WIND POWER RESEARCH CENTRE | Bristol | A rating |
| WINDLE & MOODIE LIMITED | LONDON | A rating |
| Windle Trust International | Oxford | A rating |
| Windles Group Manufacturing Limited | Thame | A rating |
| Windlesham House School | Pulborough | A rating |
| Windlesham services LtD | Crowborough | A rating |
| WINDMILL AUTOS LIMITED | Sandy | A rating |
| Windmill Hill Store & Post Office | Hailsham | A rating |
| windmill Lodge Ltd | Buntingford | A rating |
| Windmill Service Station | Blackpool | A rating |
| Windmill Smart Solutions Limited | Abingdon-On-Thames | A rating |
| WINDMILL STORE | LONDON | A rating |
| WINDMILL STORES GROUP LTD | Kettering | A rating |
| Windmill Surgery | Coventry | A rating |
| Window Cleaning Warehouse Ltd | Barry | A rating |
| Window to the Womb (Coventry) | Coventry | A rating |
| Window To The Womb Birmingham | Birmingham | A rating |
| Window to the Womb Cambridge | Newmarket | A rating |
| Window To The Womb Stoke | Newcastle Under Lyme | A rating |
| Window to the Womb Wolverhampton | Bilston | A rating |
| Window Warehouse Architectural Ltd | Leicester | A rating |
| WINDOW2THEWORLD LTD | Bath | A rating |
| Windows For Children Limited | Chatham | A rating |
| Windracers Group Limited | Fareham | A rating |
| Windracers Limited | Fareham | A rating |
| Windrose Bar & Bistro | Carrickfergus | A rating |
| Windrose Consulting Group Ltd. | London | A rating |
| Windrush Alliance UK CIC | Birmingham | A rating |
| Windrush Care Ltd | Cheltenham | A rating |
| Windrush Medical Practice | Witney | A rating |
| windrush surgery | Oxon | A rating |
| Windrush Valley School | Oxfordshire | A rating |
| Windsar Care Centre Ltd | Slough | A rating |
| Windsar Care Limited t/a Salt Hill Care Centre | Slough | A rating |
| Windsor Clinical And Home Care Services Group Ltd | Hurley | A rating |
| Windsor Convenience Store | Rotherham | A rating |
| Windsor Court Care Limited T/As Windsor Court Care Home | Bournemouth | A rating |
| Windsor Forest Colleges Group | Slough | A rating |
| Windsor Holdings Limited TA Foxhills Club & Resort | Ottershaw | A rating |
| Windsor House Group Practice | Leeds | A rating |
| Windsor Learning Partnership | Windsor | A rating |
| Windsor Manor Enterprise | LEICESTER | A rating |
| WINDSOR ROAD GARAGE LTD | BEDFORD | A rating |
| Windtech Consultants (Europe) Limited | London | A rating |
| Windward Energy Limited | Cardiff | A rating |
| WINDWARD MARINE RISK (UK) LTD | London | A rating |
| Windward Shipping (London) Ltd | London | A rating |
| WINDY MIMAS CONSULTANCY LTD | London | A rating |
| Wine and Dine Limited | Leicester | A rating |
| WINE CABIN | BROMSGROVE | A rating |
| WINE DIRECT LTD | London | A rating |
| WINE EXPRESS (POUNDHILL) LTD t/a Wine Express | Crawley | A rating |
| Wine Inns Ltd | Belfast | A rating |
| Wine Owners Limited | London | A rating |
| WINE WELL LTD T/A PREMIER | Wivenhoe, | A rating |
| WINE-SEARCHER UK LIMITED | London | A rating |
| Winebox Company Limited | London | A rating |
| WINEFINCH LTD | London | A rating |
| Wineify Ltd | Watford | A rating |
| Wines of World Ltd | Feltham | A rating |
| Winesom Ltd | London | A rating |
| Winfo Solutions UK Limited | London | A rating |
| WING AVIATION UK LIMITED | LONDON | A rating |
| Wing Energy Ltd | West Bridgford, Nottingham | A rating |
| WING FUNG (FIFE) LIMITED | Kirkcaldy | A rating |
| Wing Group Ltd | London | A rating |
| WING TAI RESTAURANT | LONDON | A rating |
| WING TIAN U.K. INVESTMENT LTD. | Loughborough | A rating |
| WINGATE CARE HOMES LTD | WESTHOUGHTON | A rating |
| WINGATE ELECTRICAL PLC | Hampshire | A rating |
| Wingerworth Medical Centre | Chesterfield | A rating |
| Wingfield Stores | Caerphilly | A rating |
| Wingrove House Limited | Eastbourne | A rating |
| Wingrove Legal Limited | Newcastle Upon Tyne | A rating |
| Wings for Life UK Spinal Cord Research Foundation | London | A rating |
| Wings International (Middlesbrough) Limited | Middlesbrough | A rating |
| WINGS INTERNATIONAL LIMITED | Bradford | A rating |
| WINGS LONDIS | LEIGHTON BUZZARD | A rating |
| Wings Manchester Drys Good Wholesale Ltd | Manchester | A rating |
| Wings of Refuge Ministries Limited | Leeds | A rating |
| Wings Properties | Romford | A rating |
| WINGS SECURITY LTD | London | A rating |
| Wings Trading Ltd | Clwyd | A rating |