| Warr & Co Limited | Stockport | A rating |
| Warraich Catering ltd | Glasgow | A rating |
| Warren Farm Holiday Centre Limited | Burnham on sea | A rating |
| Warren Hall (Oldbury Limited ) | West Midlands | A rating |
| Warren Heath Residential Home Limited | Ipswich | A rating |
| Warren Homecare Ltd | Bury St Edmunds | A rating |
| Warren House Hotels Limited | Kingston Upon Thames | A rating |
| Warren House Veterinary Centre Ltd | Walsall | A rating |
| Warren Johnson Limited | London | A rating |
| Warren-Morrison UK Ltd | Eastleigh | A rating |
| Warrendale Cottage Limited | Chester | A rating |
| Warrener Stewart Limited | London | A rating |
| Warrengate Medical Centre | Wakefield | A rating |
| Warrengate Nursing Home | Tadworth | A rating |
| Warrenpoint Harbour Authority | Warrenpoint | A rating |
| Warrens247 Healthcare Ltd | Barnsley | A rating |
| Warriewood Limited | Plympton | A rating |
| Warrington & Vale Royal College | Warrington | A rating |
| Warrington and Halton Hospitals NHS Foundation Trust | Warrington | A rating |
| Warrington Borough Council | Warrington | A rating |
| WARRINGTON CASH & CARRY LIMITED | Warrington | A rating |
| Warrington Robotics Limited | Halesowen | A rating |
| Warrington Wolves Rugby League Football Club | Warrington | A rating |
| Warrior Doors | Tyseley, Birmingham | A rating |
| Warrior Sports Rehabilitation Ltd | London | A rating |
| Warrior Warehouses Limited | Camborne | A rating |
| Warriors Basketball Club | Leicester | A rating |
| Warriors TMA Academy Limited | Coventry | A rating |
| Warsi Halal Meat Limited | QUEENSBURY | A rating |
| Wartsila Defence Solutions Ltd | Havant | A rating |
| Wartsila Energy Storage UK Ltd | Fareham | A rating |
| Wartsila UK Ltd | Fareham | A rating |
| Wartsila Voyage UK Limited | Portsmouth | A rating |
| Wartsila Water Systems Limited | POOLE | A rating |
| WARVAL TRADING & CONTRACTING UK LTD 15275659 | LONDON | A rating |
| Warwick 1 Food Limited | Coventry | A rating |
| Warwick Acoustics Limited | Coventry | A rating |
| Warwick Capital Partners LLP | London | A rating |
| Warwick Care Services For You Ltd | Rugby | A rating |
| Warwick Engineering (NI) Ltd | Ballymena | A rating |
| Warwick Fabrics (UK) Limited | Gloucester | A rating |
| Warwick Healthcare Ltd | Leicester | A rating |
| Warwick Heating & Bathroom Supplies | Acocks Green | A rating |
| Warwick House Dental Surgery | Berkshire | A rating |
| Warwick Independent Schools Foundation | Warwick | A rating |
| WARWICK PINE LTD | Birmingham | A rating |
| Warwickshire College Group | Leamington Spa | A rating |
| Warwickshire County Council | Warwick | A rating |
| Warwickshire County Cricket Club | Birmingham | A rating |
| Warwickshire Horseboxes Limited | Warwickshire | A rating |
| Warwickshire Living LTD | Chipping, Campden | A rating |
| Warwickshire Wildlife Trust | Coventry | A rating |
| Wary Secure Ltd | London | A rating |
| WASABI CO LIMITED | LONDON | A rating |
| Wasco Coating UK Ltd | Hartlepool | A rating |
| Wasdale Head Inn Limited | Seascale | A rating |
| WASE Limited | Bristol | A rating |
| Waseda Academy UK Co., Limited | London | A rating |
| WASEER SILVER LTD | Manchester | A rating |
| Wash Connect Ltd | London | A rating |
| Washington Cricket Club CIC | Washington | A rating |
| Washington Green Retail Limited | Birmingham | A rating |
| Washington Metalworks LTD | Gateshead | A rating |
| Washington News | Maldon | A rating |
| Washington Specsavers Limited | Washington | A rating |
| Wasi Cinematic Media Ltd | Birmingham | A rating |
| Wasim Jewellers | Bradford | A rating |
| WASO Ltd | London | A rating |
| Wason (UK) Limited | York | A rating |
| Wasps | Coventry | A rating |
| WASSERMAN EMEA LLP | London | A rating |
| Waste Logics Software Limited | London | A rating |
| Waste4Generation Ltd | Corby | A rating |
| Wastecare Limited | Wakefield | A rating |
| Wasted Talent LTD | London | A rating |
| Wastefront Limited | Warwick | A rating |
| WASTEMOVE LIMITED | Ilford | A rating |
| Wastewater Fuels Ltd | Coventry | A rating |
| WASZ LIMITED | SURREY | A rating |
| WAT ARUN NORFOLK UK | NORWICH | A rating |
| Wat Buddharam (London) | ROMFORD | A rating |
| Wat Buddharam Leeds | Leeds | A rating |
| Wat Matchimaram UK | Leeds | A rating |
| WAT MONGKHONWARARAM UK | LOUGHBOROUGH | A rating |
| Wat Pa Buddharam | Wellingborough | A rating |
| WAT PA TESARANGSEE UK | New Milton | A rating |
| Wat Phra Singh UK | Runcorn | A rating |
| WAT SRI INTRA ATULA | CRAWLEY | A rating |
| Wat Sriratanaram Temple | Bolton | A rating |
| Wat Thai Southend | Westcliff on Sea | A rating |
| Watan Builders Ltd | Failsworth, Manchester | A rating |
| WATAN CONTINENTAL STORE LTD | Cleveland | A rating |
| WATAN HALAL MEAT LIMITED | Birmingham | A rating |
| Watan Ilford Ltd | Ilford | A rating |
| Watan Superstore (Bradford) Limited T/A Watan Superstore | Bradford | A rating |
| WATAN TOOTING LTD | London | A rating |
| WATAN WHOLESALE LIMITED | Aylesbury | A rating |
| Watanhalal Ltd | Edgware | A rating |
| Watch Security Limited | Rotherham | A rating |
| WATCH SQUAD SECURITY LTD | London | A rating |
| Watchdog Fire & Security Ltd | Finchley | A rating |
| Watches of Switzerland Operations Limited | Leicester | A rating |
| Watches World Limited | London | A rating |
| WATCHFINDER.CO.UK LIMITED | West Malling | A rating |
| WatchMyCompetitor.com LTD | London | A rating |
| WatchNation Limited | Chester | A rating |
| Watcho Ltd | Milton Keynes | A rating |
| Water and Sanitation for the Urban Poor | London | A rating |
| Water Direct Limited | Colchester | A rating |
| WATER ENGINEERING INDUSTRIAL EQUIPMENT (UK) LTD (16652955) | ENGLAND | A rating |
| Water Environmental Treatment Limited | Tamworth | A rating |
| Water Gems (Alba) Limited | Edinburgh | A rating |
| Water Hygiene Centre Limited | Charlbury | A rating |
| Water Margin Restaurant | Coleraine | A rating |
| Water Orton Pizza ltd | Birmingham | A rating |
| Water Services Regulation Authority (Ofwat) | Birmingham | A rating |
| WATER SYSTEM MANAGEMENT LTD | EDGWARE, MIDDLESEX | A rating |
| WATER TECH PURIFICATION LTD | Birmingham | A rating |
| Water Tecnik Limited | Newry | A rating |
| Water Unite | London | A rating |
| Water Witness International | Edinburgh | A rating |
| WaterAid | London | A rating |
| Watercycle Technologies | Manchester | A rating |
| WATERFALL & O`BRIEN LIMITED | Bristol | A rating |
| Waterfall Asset Management (UK) LLP | London | A rating |
| WATERFIELDS LETTINGS LTD | Southsea | A rating |
| WATERFIELDS SOLICITORS | LONDON | A rating |
| Waterfoot Medical Practice | Rossendale | A rating |
| Waterfront Broadway Ltd T/A Wildfire | Edinburgh | A rating |
| Waterfront Fluid Controls | Glasgow | A rating |
| Waterfront Solicitors LLP | London | A rating |
| Watergate Bay Hotel Limited T/A Watergate Bay Hotel | Newquay | A rating |
| WATERGATES LTD | Leicester | A rating |
| WATERHILL LTD | London | A rating |
| Waterhouses Medical Practice | Waterhouses | A rating |
| Waterland Private Equity Ltd | London | A rating |
| Waterlily Enterprise Limited | Mansfield | A rating |
| Waterloo Care Ltd | Bidford-On-Avon | A rating |
| Waterloo Convenience Store Limited | Gorleston | A rating |
| Waterloo Hotel Operator Limited | London | A rating |
| Waterloo House | Market Rasen | A rating |
| Waterloo House Care Home Ltd | Bedford | A rating |
| WATERLOO HOUSE REST HOME LIMITED | BLYTH | A rating |
| Waterloo Manor Limited | Leeds | A rating |
| Waterloo Medical Centre | Blackpool | A rating |
| Waterloo Pharma Ltd | Stoke-on-Trent | A rating |
| WATERLOO RESTAURANTS LIMITED T/A La Cucina Di Mamma | London | A rating |
| WATERMAN (UK) LIMITED | WALTHAMSTOW | A rating |
| Waterman Group plc | London | A rating |
| Watermark Accountants Ltd | Manchester | A rating |
| Watermark Group Limited | Portsmouth | A rating |
| WATERMARK TECHNOLOGIES LTD | SHIPLEY | A rating |
| Watermead Care Ltd | Nottingham | A rating |
| Watermeadow Grange Care Home | Exeter | A rating |
| Watermoor House RCH | Cirencester | A rating |
| WaterRise Limited | London | A rating |
| WaterRower (UK) Ltd | HIGH WYCOMBE | A rating |
| Waters Limited | Wilmslow | A rating |
| Waters Park House Ltd | Plymouth | A rating |
| Waterscapes Limited | Wincanton | A rating |
| WATERSEDGE BLUE LTD T/A Exmoor Dental Centre | Minehead | A rating |
| Watershed Arts Trust Limited | Bristol | A rating |
| WATERSHED CARE SERVICES LTD | CAMBERLEY | A rating |
| Watershed Packaging Ltd | Leeds | A rating |
| Watershed Technology Limited | London | A rating |
| WATERSIDE CONVENIENCE STORE | Burton On Trent | A rating |
| Waterside Dental Limited | Coleraine | A rating |
| Waterside Medical Centre | Leamington Spa | A rating |
| Waterside Strathaven Ltd | Strathaven | A rating |
| Waterslade Ltd | Witney | A rating |
| Waterson Hicks | London | A rating |
| WATERSPRINGS CHRISTIAN CENTRE | LUTON | A rating |
| Waterstone Chambers LLP t/a Waterstone Legal | City of London | A rating |
| Waterstones Bookseller Ltd | London | A rating |
| Waterstons Ltd | Durham | A rating |
| Waterwhelm Ltd | Edinburgh | A rating |
| Waterworks Operating Company UK Limited | London | A rating |
| Waterworks Stores Limited | Immingham | A rating |
| Wates Group Ltd | Surrey | A rating |
| Watford 3PL LTD | Watford | A rating |
| Watford and Three Rivers Trust | Watford | A rating |
| Watford Borough Council | Watford | A rating |
| Watford Coffee Ltd | Watford, | A rating |
| WATFORD FOOD CULTURE LIMITED | WATFORD | A rating |
| Watford Foodbank & Community Relief Trust (Watford Foodbank) | Watford | A rating |
| Watford Grammar School for Boys | Watford | A rating |
| Watford Hotel Ltd T/A Holiday Inn Express London - Watford Junction | Watford | A rating |
| WATFORD MAEME'S LIMITED | Watford | A rating |
| Watford School Uniforms Limited | Watford | A rating |
| WATFORD SERVICE STATION LIMITED | Northolt | A rating |
| Watford Sweets Ltd | Watford | A rating |
| WATFORD VELMURUGAN TRUST | WATFORD | A rating |
| Watford Visionplus Ltd T/A Specsavers | Watford | A rating |
| Wath Cricket Club Limited | Rotherham | A rating |
| Wathnan Racing (UK) Limited | Newmarket | A rating |
| Watkin Property Ventures Developments Limited | Bangor | A rating |
| Watkins Media Limited | London | A rating |
| Watkins Payne Limited | Sunbury on Thames | A rating |
| Watling Street Dental Care | Gillingham | A rating |
| Watling Street Practice | Stony stratford | A rating |