| Wiggin LLP | Cheltenham | A rating |
| Wiggleys Corner Shop | Oxford | A rating |
| Wight Clinic | Ryde | A rating |
| Wight Shipyard Co Limited | East Cowes | A rating |
| Wightlink Ltd | Portsmouth | A rating |
| Wightman Fishing Co Ltd | Lowestoft | A rating |
| Wigmore Medical Ltd | London | A rating |
| Wigmore Primary School | Luton | A rating |
| WIGSTON BUILDING CONTRACTORS LIMITED | Leicester | A rating |
| Wigston Pharmacy Ltd | LEICESTER | A rating |
| Wigton Group Medical Practice | Wigton | A rating |
| Wika Instruments Limited | Sevenoaks | A rating |
| Wikborg Rein LLP | London | A rating |
| Wiki Networks Limited | Mitcham | A rating |
| Wiki Soft Tech Limited | Preston | A rating |
| Wikimedia UK | London | A rating |
| Wilben Trade (UK)Limited | London | A rating |
| Wilbraham Limited | Stoke on Trent | A rating |
| WILBRAHAM STORES LIMITED | Whitchurch | A rating |
| Wilbury Care Home Limited | Hove | A rating |
| Wild 15 LTD | London | A rating |
| Wild Acres Rest Home Limited | Wokingham | A rating |
| WILD AT HEART SILVER | DONCASTER | A rating |
| Wild Bioscience Limited | Abingdon | A rating |
| Wild Brain Family International Limited | London | A rating |
| WILD BUSH LIMITED | Richmond | A rating |
| Wild Cosmetics Limited | London | A rating |
| WILD DOSE LTD | London | A rating |
| WILD EMBER GROUP LIMITED | London | A rating |
| Wild Futures | Looe | A rating |
| Wild Island Films | London | A rating |
| Wild Nutrition Ltd | Lewes | A rating |
| WILD PEACOCK LIMITED | London | A rating |
| Wild Recruitment Limited | London | A rating |
| Wild Side Vets | Barrow in Furness | A rating |
| Wild Wellness Projects Ltd | London | A rating |
| WILD YAK 62 LTD | London | A rating |
| Wild Yak Limited | London | A rating |
| Wildan Legal Solicitors Ltd | London | A rating |
| Wildanet Ltd | Cornwall | A rating |
| Wildax Conversions Ltd | Elland | A rating |
| Wildcat Law Ltd | Southampton | A rating |
| WILDCATS COMBAT LTD | Harrow | A rating |
| WILDER LOGISTICS LIMITED | Berkshire | A rating |
| Wildfire Entertainment Ltd t/a Oblix | London | A rating |
| Wildfire Strategies UK Limited | London | A rating |
| Wildflower Home Care | Godalming | A rating |
| Wildfowl & Wetlands Trust | Gloucester | A rating |
| WildHearts Office Limited | Glasgow | A rating |
| Wildix UK Limited | Coventry | A rating |
| WildKat PR Ltd. | London | A rating |
| Wildland Limited | Kinrara | A rating |
| Wildlife Conservation Society | Cambridge | A rating |
| Wildpark Entertainment Ltd | London | A rating |
| wilds ltd | Radcliffe | A rating |
| Wildseed Studios Limited | Bristol | A rating |
| Wildstar Films Limited | Bristol | A rating |
| WILDSTONE CAPITAL LIMITED | LONDON | A rating |
| Wildwood Church Stafford | Stafford | A rating |
| Wileman Engineers Ltd | Ashby de la Zouch | A rating |
| Wilfix Ltd T/A Truck and Trailer Conversions | Bristol | A rating |
| Wilfords London Limited | London | A rating |
| Wilfred T Fry Ltd | Worthing | A rating |
| Wilfrid Whittington Ltd | Nottingham | A rating |
| Wilhelmina London Limited | London | A rating |
| Wilhelmsen Ships Service Limited | Dartford | A rating |
| WILIOT UK LTD | London | A rating |
| Wilker UK Limited | Sandbach | A rating |
| WilKerr Care Services Ltd | Paisley | A rating |
| Wilkhahn Limited | London | A rating |
| Wilkin & Sons Ltd | Colchester | A rating |
| Wilkinson & Son | Durham | A rating |
| Wilkinson Beven Design Limited | Birmingham | A rating |
| Wilkinson Eyre Architects Ltd | London | A rating |
| Wilkinson Sword Limited | London | A rating |
| WILKINTON LTD T/A 3 SIXTY | Cardiff | A rating |
| WILKS STREET MOT CENTRE LIMITED | Stoke On Trent | A rating |
| Will Chemists (Inverurie) LTD | Inverurie | A rating |
| WILL INTERIORS LTD | WOLVERHAMPTON | A rating |
| Will International Limited | Chertsey | A rating |
| Will It Make The Boat Go Faster? Ltd | Coalville | A rating |
| will jones agri services | Carmarthen | A rating |
| Will Powder Ltd | Clitheroe | A rating |
| Will Rudd Davidson (Edinburgh) Ltd | Edinburgh | A rating |
| Willan House (Stainfield) Limited | Lincoln | A rating |
| WILLAND SERVICES LIMITED | Exeter | A rating |
| Willaston Physiotherapy Ltd | Bromborough | A rating |
| Willbern Care Limited T/a Courtlands Care Home | Penzance | A rating |
| Willboag Ltd | London | A rating |
| Willcox Bros Ltd t/a AbleCare Homes | Bristol | A rating |
| Willenhall Car Parts Ltd | Willenhall | A rating |
| Willenhall Dental Care | Coventry | A rating |
| Willenhall Oak Medical Centre | Coventry | A rating |
| Willerby Investments Limited | Hull | A rating |
| Willerby Landscapes Ltd | Edenbridge | A rating |
| Willes Farming Limited | Bideford | A rating |
| WILLESDEN MAIL LTD | London | A rating |
| WILLESDENS LTD | Sheffield | A rating |
| Willett Food Projects Ltd | lyme regis | A rating |
| Willett House Vets Limited | Staines | A rating |
| Willett Lodge Care Home LTD | Worthing | A rating |
| William Associates (MR) Ltd | Birmingham | A rating |
| William Bell Tractors Ltd. | Fivemiletown | A rating |
| William Blair International Limited | London | A rating |
| WILLIAM COLLEGE LTD | London | A rating |
| WILLIAM CONSULTANT LIMITED | Essex | A rating |
| William Cook Rail Limited | Sheffield | A rating |
| William Drake Limited | Buckfastleigh | A rating |
| William Elliott Limited | Mildenhall | A rating |
| William Emerson Limited | Winkfield | A rating |
| William Fitzgerald O'Connor | Hatford | A rating |
| William Grant & Sons Ltd | Dufftown | A rating |
| William Grant and Company Limited | Londonderry | A rating |
| William Hare Limited | Bury | A rating |
| William Harper | Midhurst | A rating |
| William Hartley Group Limited | London | A rating |
| William Hicks t/a SOUL SATISFACTION | St Annes-on-the-Sea | A rating |
| William Hickson | Kent | A rating |
| William Hill | Leeds | A rating |
| WILLIAM HYNES GROUP LIMITED | Gateshead | A rating |
| William IV | London | A rating |
| William Jackson Food Group | Hull | A rating |
| WILLIAM KATENY LEGAL LIMITED | London | A rating |
| William Knight Racing Ltd | Newmarket | A rating |
| William Matthews Associates Limited | London | A rating |
| William Mccartney LTD | eglinton | A rating |
| William Millard | Shipley | A rating |
| William Morris Endeavor Entertainment (U.K.) Ltd | LONDON | A rating |
| William Muir | Lambourn, Hungerford | A rating |
| William Reed Ltd | Crawley | A rating |
| William Reid Limited | Belfast | A rating |
| William Russell Limited | Lightwater | A rating |
| William Say and Company Limited | London | A rating |
| William Simpsons | Stirling | A rating |
| William T Healthcare Ltd | Leicester | A rating |
| William Thompson and Son Dumbarton Limited | DUNBARTONSHIRE | A rating |
| William Tozer Associates Ltd. | London | A rating |
| William Tyndale Primary School | London | A rating |
| WILLIAM UK CONSTRUCTION LTD | LUTON | A rating |
| Williams and Barry Ltd | Edinburgh | A rating |
| Williams College Oxford Programme | Oxford | A rating |
| Williams Grand Prix Engineering Limited | Grove | A rating |
| Williams Jet Tenders Ltd | Berinsfield | A rating |
| Williams Lea | London | A rating |
| Williams Motors Cwmdu Ltd | Brecon | A rating |
| Williams Murray Hamm | London | A rating |
| Williams Stanley and Co Limited | London | A rating |
| Williams Welfare Ltd | Ruislip | A rating |
| WILLIAMS WEST CONSULTING LIMITED | LONDON | A rating |
| WILLIANSHOP LTD T/A SHILLINGTON VILLAGE STORES | BEDS | A rating |
| Willingham Healthcare Ltd | Cambridge | A rating |
| Willington Care Village | Willington | A rating |
| Willington CC | Crook | A rating |
| Willington Post office | Crook | A rating |
| Willis Aviation Services Limited | Darlington | A rating |
| Willis Engine Repair Centre (UK) Limited | Bridgend | A rating |
| Willis Limited | London | A rating |
| Willis Mitsui & Co. Asset Management Limited | Bridgend | A rating |
| Willis Re (UK) Limited | London | A rating |
| Willkie Farr & Gallagher (UK) LLP | London | A rating |
| Willmott Dixon Group | Letchworth Garden City | A rating |
| Willmotts Ealing Limited | London | A rating |
| Willo Game Ltd t/a Willo Game | Norbury | A rating |
| WILLOVER PROPERTY LIMITED | Stoke-On-Trent, | A rating |
| Willow | SOLIHULL | A rating |
| Willow and Co Group Ltd | Ellesmere Port | A rating |
| Willow Blossom Holdco Limited | London | A rating |
| WILLOW CARE HOMES LTD T/A THE GRANGE | St. Leonards-On-Sea | A rating |
| Willow Chiropractic Partnership Limited | Bristol | A rating |
| Willow Equity Management Limited | Chertsey | A rating |
| Willow Farm Food & Wine Ltd | London | A rating |
| WILLOW HEALTH LIMITED | Colchester | A rating |
| willow home care Leeds LTD | Leeds | A rating |
| Willow Home Care Ltd | Shropshire | A rating |
| Willow ISV Construction Ltd | London | A rating |
| WILLOW KLSD LIMITED, T/A Willow Pharmacy | SLOUGH | A rating |
| Willow Learn Limited | London | A rating |
| Willow Learning Trust | Sutton | A rating |
| Willow Pharmacy Limited T/A Gibbs & Gurnell | Isle Of Wight | A rating |
| Willow Recruitment London Ltd | Harrow | A rating |
| Willow Support Ltd | Marlow | A rating |
| Willow Tree Childrens Services LTD | Reading | A rating |
| Willow Tree Nursing Home | Rugby | A rating |
| Willow Tree Support Limited | Littleborough | A rating |
| Willow Tree Support Services Ltd | READING | A rating |
| Willow View Care LTD | STOCKTON | A rating |
| Willowbank Care Ltd | Bristol | A rating |
| Willowbank Rest Home | Clayton Le Woods | A rating |
| Willowbrook Healthcare Limited | Northampton | A rating |
| Willowbrook house | cardiff | A rating |
| Willowbrook Medical Practice | Sutton-in-Ashfield | A rating |
| Willowcity Estates Limited | Hertford | A rating |
| Willowfield Parish Community Association | Belfast | A rating |
| WILLOWMEAD RESIDENTIAL HOME LIMITED | SURREY | A rating |
| Willows Care Home | Chester | A rating |
| Willows Deli Ltd | Clapham | A rating |
| Willows Group Limited | Leicester | A rating |
| Willows Lodge limited | Tilbury | A rating |
| Willows Pharmacy | Downham Market | A rating |
| Willows Pre-School Limited | London | A rating |