| Dia-Stron Limited | Andover | A rating |
| Diabetes Consults | Rochester | A rating |
| Diaceutics PLC | Belfast | A rating |
| Diadem Ministries international -Diadem Church | LONDON | A rating |
| DIADEMS DAY NURSERY | London | A rating |
| Diageo plc | London | A rating |
| DIAGNAL UK LTD | SEVENOAKS | A rating |
| Diagnexia UK Limited | Exeter | A rating |
| Diagnostic Healthcare Ltd | Manchester | A rating |
| Diagnostic World Ltd | Leeds | A rating |
| Diagnostics for the Real World (Europe) Ltd | Essex | A rating |
| Diagonal Works Limited | Theme | A rating |
| Diagram Capital Ltd | London | A rating |
| Diagrama Foundation UK | Chatham | A rating |
| Diahearts Limited | London | A rating |
| Dial A Builder Ltd | BIRMINGHAM | A rating |
| DIAL A CAB ROTHERHAM LTD | ROTHERHAM | A rating |
| Dial A Curry (Kent) Ltd T/A Dial A Curry | Canterbury | A rating |
| DIAL GLOBAL LTD | LEAMINGTON SPA | A rating |
| Dial Halal Limited | London | A rating |
| Dial House Care Ltd | Bedford | A rating |
| DIAL ONE SERVICES LTD | LONDON | A rating |
| Dial1st Construction Limited | Greenford | A rating |
| Dial4panels Ltd | High Wycombe | A rating |
| DIALECT LIMITED | BATH | A rating |
| DIALECTICA LTD | LONDON | A rating |
| Diales Group Plc | London | A rating |
| Dialight PLC | London | A rating |
| Dialogue Earth | London | A rating |
| Dialogue Language Services International Ltd. | Swindon | A rating |
| Dialogue Matters Ltd | East Brabourne | A rating |
| Dialon Limited T/A Domino's Pizza | Romford | A rating |
| Dialpad UK Ltd | London | A rating |
| Diam UK Limited | Loughborough | A rating |
| Diama Security Limited | Canary Wharf | A rating |
| DIAMANTE FLOORING LIMITED | Glasgow | A rating |
| DIAMED LONDON CLINIC LIMITED | LONDON | A rating |
| DIAMER UK LTD | Oldham | A rating |
| Diameter Capital Partners (UK) LLP | London | A rating |
| Diamond (Barrow) Limited | Barrow-In-Furness | A rating |
| DIAMOND (EDIBLES) LIMITED | Walsall | A rating |
| DIAMOND AUTO REPAIRS LTD | High Wycombe | A rating |
| Diamond Bedz Ltd | Huddersfield | A rating |
| Diamond Black Limited | Luton | A rating |
| Diamond Blinds Ltd | Bradford | A rating |
| Diamond Box Limited | West Bromwich | A rating |
| Diamond Builders Merchants Ltd | Barking | A rating |
| DIAMOND CARE AND SERVICES LIMITED | Brentwood | A rating |
| DIAMOND CARE HOMES LANGDALES LTD | Birmingham | A rating |
| Diamond Care Solutions Ltd | Nottingham | A rating |
| Diamond Clothing Ltd | West Bromwich | A rating |
| Diamond Coatings Limited | West Midlands | A rating |
| DIAMOND CONTROLS LIMITED | Norwich | A rating |
| DIAMOND COURIER UK SERVICES LTD | Romford | A rating |
| Diamond Dental Care | Clydebank | A rating |
| DIAMOND EDUCARE LIMITED | London | A rating |
| Diamond Embellecers | London | A rating |
| DIAMOND ESTATES & HOMES LTD | Oxford | A rating |
| DIAMOND EXPORT INDUSTRIES LTD | Manchester | A rating |
| Diamond Facilities Support Limited | Birmingham | A rating |
| DIAMOND FOOD SALES LTD | WEMBLEY | A rating |
| DIAMOND FRUIT | Glasgow | A rating |
| DIAMOND FUNCTIONS LIMITED | CHESHAM | A rating |
| Diamond Gate Care Services Limited | London | A rating |
| DIAMOND HARBOUR LIMITED | London | A rating |
| Diamond Hard Surfaces Ltd | Towcester | A rating |
| DIAMOND HEAD SERVICES LTD | London | A rating |
| DIAMOND HEALTH CARE SOLUTIONS LTD | Coventry | A rating |
| Diamond Health Group | Yeovil | A rating |
| Diamond Home Support (Bury Bolton) Limited | Salford | A rating |
| Diamond House Care Home Limited T/A Diamond House | Downham Market | A rating |
| DIAMOND IMPEX LTD | LUTON | A rating |
| Diamond Inscriptions Ltd | Altrincham | A rating |
| DIAMOND JOINERIES LTD | Hayes | A rating |
| Diamond Light Source Ltd | Didcot | A rating |
| DIAMOND MEDS LIMITED | Fetcham | A rating |
| Diamond Mobile Phones Ltd | Morpeth | A rating |
| DIAMOND NAILS BEAUTY LTD | Hertfordshire | A rating |
| DIAMOND NAILS HLL LTD | London | A rating |
| Diamond of Chester Camelot Limited | Chester | A rating |
| DIAMOND PIZZA N KEBAB LIMITED ltd | Southampton | A rating |
| DIAMOND PLUS TELECOM LTD | ILFORD | A rating |
| Diamond Prints 49 LTD | Bury | A rating |
| Diamond PVT Ltd | Portsmouth | A rating |
| Diamond Resorts (Europe) Limited | Lancaster | A rating |
| Diamond Roofing & Build Ltd | Hayes | A rating |
| Diamond Scaffolding (South East) Limited | Dartford | A rating |
| Diamond Skin Care Ltd | Little Melton | A rating |
| DIAMOND-CUBE LIMITED | LONDON | A rating |
| Diamond786 Ltd t/a PC Masters and Mobile Experts | Leeds | A rating |
| Diamondair International Limited | London | A rating |
| Diamonds Guest House Ltd | York | A rating |
| Diamonds Inn Ltd | York | A rating |
| Diamonds Investments Limited | Manchester | A rating |
| Diamonds Property Development Private Ltd | York | A rating |
| Diamondsbyuk Ltd | London | A rating |
| DIAMOUR LTD | London | A rating |
| Diana & George Ltd | London | A rating |
| DIANA LONDON LTD | London | A rating |
| Diana Souvenirs Ltd | London | A rating |
| DIANCANG TRADING UK LTD | London | A rating |
| Diaperfect Ltd | London | A rating |
| Diarossa Ltd | Northwood | A rating |
| DiaSorin Italia S.p.A UK Branch | Dartford | A rating |
| DiaSorin Limited | Dartford | A rating |
| Diaspora African Women's Support Network CIC | Glasgow | A rating |
| Diaverum UK Ltd | St Albans | A rating |
| Diazone Computer Services Ltd | Sale | A rating |
| DIBA INDUSTRIES LIMITED | Cambridge | A rating |
| DIBAL UK LIMITED | Sidcup | A rating |
| Diban Ltd | Offley, Hitchin | A rating |
| DibCo Limited | London | A rating |
| Dibend Ltd | Gosport | A rating |
| DIBERA LTD | Durham | A rating |
| Dice Consulting Engineers Ltd | Nottingham | A rating |
| DICE FM LTD | London | A rating |
| DICE Healthcare LTD | Mansfield | A rating |
| DICEDIGITALSTUDIO LTD | WILLENHALL | A rating |
| Dicefore ltd t/a village pharmacy | Pinner | A rating |
| DICKENS INTERNATIONAL LIMITED | salford | A rating |
| Dickies Farm Dining Ltd (Trading as Restaurant Jericho) | Plungar | A rating |
| Dickory Docks Educational Day Nursery | Reading | A rating |
| Dictate IT Ltd. | London | A rating |
| DIDA'S FASHION CLOTHING LIMITED | London | A rating |
| Didac Schools Ltd | EASTBOURNE | A rating |
| Didactic Services Ltd. | Northampton | A rating |
| Didar Transport Limited | Slough | A rating |
| Didcot Cricket Club | Didcot | A rating |
| DIDCOT DENTAL GROUP LTD | Manchester | A rating |
| Didcot Health Centre Practice | Didcot | A rating |
| didcot home care ltd | Didcot | A rating |
| DIDCOT SUBWAY LTD T/A SUBWAY | DIDCOT | A rating |
| Didcot Visionplus Limited T/A Specsavers Opticians | Didcot | A rating |
| DiDi Mobility UK Limited | London | A rating |
| DIDO IMPORT & EXPORT LTD | London | A rating |
| Didriksons UK Ltd | Manchester | A rating |
| DIDSBURY CHILDMINDING LIMITED | Manchester | A rating |
| Didsbury Engineering Co Ltd | Wilmslow | A rating |
| Diebold Nixdorf (UK) Limited | Bracknell | A rating |
| DIEHL METERING LIMITED | Halifax | A rating |
| Diem UK Enterprises Limited | London | A rating |
| Diesel Automotive Ltd | OLDBURY | A rating |
| Diesel services ltd | Uxbridge | A rating |
| Dieselec Thistle Generators Limited | GLASGOW | A rating |
| Diespeker Marble and Terrazzo Ltd | London | A rating |
| Diesta Limited | London | A rating |
| Diet Care LTD | London | A rating |
| DIF Management UK Limited | London | A rating |
| Diffblue Ltd | Oxford | A rating |
| Different Care Holdings Ltd | Liverpool | A rating |
| Different Dog Limited | Telford | A rating |
| Different Roads Management Limited | Kyle of Lochalsh | A rating |
| DIFFERENTIA CONSULTING LTD | HIGH WYCOMBE | A rating |
| Differentiated Ltd | Mortimer Common | A rating |
| Differentology Ltd | Newcastle upon Tyne | A rating |
| Diffractive Labs Ltd | London | A rating |
| Diffusion Alloys (UK) Ltd | Middlesbrough | A rating |
| Diffusion PR and Communications Limited | London | A rating |
| Dig Ventures Advisors Limited | London | A rating |
| Digby Wells Environmental Holdings Limited | London | A rating |
| DIGESTIVE SUPPLIES LTD | LONDON | A rating |
| Digestors, Silos & Tanks Ltd T/A Silotank | Belfast | A rating |
| DIGFAD LTD | Wellingborough | A rating |
| Digger International Ltd | Blackburn | A rating |
| DIGI BROADCAST COMPANY LIMITED | Chessington, London | A rating |
| DIGI CONSULTANTS LTD | Romford | A rating |
| Digi Technology Limited | Hatfield | A rating |
| Digi World Consulting Ltd | Tebay | A rating |
| Digi-Touch Limited | London | A rating |
| DIGI4U LTD. | Cardiff | A rating |
| DigiBlu UK Limited | Chelmsford | A rating |
| Digiboost Ltd | London | A rating |
| DIGICARE MARKETING LTD | Dartford | A rating |
| Digicert UK Limited | London | A rating |
| DIGICO UK LIMITED | CHESSINGTON | A rating |
| DIGICOM EAST LONDON LIMITED | LONDON | A rating |
| DIGICOM360 LIMITED | Reading | A rating |
| Digident Laboratories Ltd | Skelmersdale | A rating |
| DigiDoe Ltd | London | A rating |
| Digifier Consulting Limited | London | A rating |
| Digiflec | Dunfermline | A rating |
| digiio ltd | London | A rating |
| digiLab Solutions Ltd | Exeter | A rating |
| DIGILED (UK) LIMITED | Beare Green | A rating |
| Diginius | London | A rating |
| Digiryte Limited | Salford | A rating |
| DIGIRYTE LTD | Salford | A rating |
| Digis Squared Ltd | Wimbledon | A rating |
| DIGISEQ LIMITED | London | A rating |
| DigiSig Rail Group Ltd | Sutton Coldfield | A rating |
| DIGISOIL LIMITED | Ilford | A rating |
| DIGIT ACCOUNTANTS LIMITED | STANMORE | A rating |
| Digit Audio Technology Ltd | Leigh On Sea | A rating |
| Digit Places Limited | London | A rating |
| DIGITAIKEN TECH CORPORATION LTD | Park Royal | A rating |
| Digitain UK Limited | London | A rating |
| DIGITAK LIMITED | Reading | A rating |
| DIGITAL (I) TECHNOLOGIES LTD | Preston | A rating |
| DIGITAL AD CONSULTANT LTD | Stoke-On-Trent | A rating |
| DIGITAL AGE PROFESSIONALS ENTERPRISE LIMITED | West Midlands | A rating |