| The Howegate Fish & Chip Shop | Hawick | A rating |
| The Hoxton (Holborn) Limited | London | A rating |
| The Hoxton (Southwark) Limited | London | A rating |
| THE HUB STORES LIMITED | Harrow | A rating |
| The Hubs Studios London Limited | London | A rating |
| The Huddersfield Town AFC Limited | Huddersfield | A rating |
| The HudsonBec Group | London | A rating |
| The Human Dignity Trust | London | A rating |
| The Humbleyard Practice | Norwich | A rating |
| THE HUNGARIAN STATE CIRCUS LIMITED | Gateshead | A rating |
| The Hungry Cow Ltd | London | A rating |
| The Hungry Elephant Bar & Grill | Coventry | A rating |
| The Huntsmith Limited | Hornchurch | A rating |
| The Hut Shop Ltd | Leven | A rating |
| The Hybrid Residences Ltd | London | A rating |
| THE HYDE NEWSAGENTS SHOP LIMITED T/A THE HYDE CONVENIENCE STORE | HERTFORDSHIRE | A rating |
| The Hyde Pharmacy | London | A rating |
| The Ibison Group Limited | London | A rating |
| THE IDCO LIMITED | Edinburgh | A rating |
| The IFRS Foundation | London | A rating |
| The Ile Dental Centre | Ilminster | A rating |
| The iLUKA Collective Ltd. | Kingston Upon Thames | A rating |
| The Imagination Group Limited | London | A rating |
| The Impact Advantage Limited | Market Harborough | A rating |
| The Impact Facility | Tetbury | A rating |
| The Imperial Ice Stars Ltd | Kinmel Bay | A rating |
| The Incorporated Bishop's Stortford College Association | Bishop's Stortford | A rating |
| The Incorporated Council of Law Reporting for England and Wales | London | A rating |
| The Incorporated National Association of British and Irish Millers | London | A rating |
| THE INDEPENDENTS CREATIVE COLLECTIVE UK LIMITED | London | A rating |
| The India Palm Ltd | Dumfries | A rating |
| The Indian Beauty Ltd T/A Cherene's Studio | Sutton | A rating |
| The Indian Chef at 3 Kilns | Leicester | A rating |
| The Indian Company Limited | Southall | A rating |
| THE INDIAN CROWN RESTAURANT LTD | HARROW | A rating |
| THE INDIAN FOOD PALACE LIMITED | Gloucester | A rating |
| The Indian Grill Restaurant Ltd T/A The Indian Grill | Maldon | A rating |
| THE INDIAN SHELF LTD | Bury St. Edmunds | A rating |
| The Indian Street Drinks and Food Company Ltd | London | A rating |
| THE INDIAN STREET KITCHEN GROUP LTD T/A THE INDIAN STREET KITCHEN GROUP | Swansea, Wales | A rating |
| The Indian Village Roads Ltd | Leeds | A rating |
| The Indians Next Door | ealing | A rating |
| THE INDUS RESTAURANT & BAR LTD | Doncaster | A rating |
| The Industrial Maintenance Group | Tamworth | A rating |
| The Infinite Kind, Limited | Edinburgh | A rating |
| THE INFORMATION LAB LIMITED | London | A rating |
| The Infra Red Heater Company | Bolton | A rating |
| The Ingham Practice | Lincoln | A rating |
| The Ingredientist LTD | London | A rating |
| The Inhouse Creative Agency Ltd | Ilkley | A rating |
| The Ink Factory Ltd | London | A rating |
| The Inn at Whitewell Limited | Clitheroe | A rating |
| The Inn on Loch Lomond | Alexandria | A rating |
| The Innovation Group (EMEA) Limited | London | A rating |
| The Innovation Unit Limited | London | A rating |
| The Inside Out Clothing Project Community Interest Company | London | A rating |
| The Inspirational Learning Group | Stafford | A rating |
| The Inspire Group Northampton Limited t/a Turvey Corner Stores and Post Office | Turvey, Bedford | A rating |
| The Installation Assurance Authority Group | Leighton Buzzard | A rating |
| The Institute of Cancer Research | London | A rating |
| The Institute of Certified Bookkeepers (ICB) | London | A rating |
| The Institute of Grocery Distribution | Letchmore Heath | A rating |
| The Institute of Ismaili Studies | London | A rating |
| The Institute of Materials Minerals & Mining | London | A rating |
| The Institute of Physics | London | A rating |
| The Institute of Sustainability and Environmental Professionals | March | A rating |
| The Institution of Engineering and Technology | Stevenage | A rating |
| The Institution of Structural Engineers | London | A rating |
| THE INTEGRITY CONSORTIUM LIMITED | London | A rating |
| The International Art & Antique Loss Register Ltd | London | A rating |
| The International Community Church | Oxshott | A rating |
| The International Institute for Strategic Studies | London | A rating |
| The International Organ Festival Society Ltd | St Albans | A rating |
| THE INTERNATIONAL SCHOOL OF ABERDEEN EDUCATIONAL TRUST LIMITED | ABERDEEN | A rating |
| The International Union of Credit and Investment Insurers (Berne Union) | London | A rating |
| The Investigo Group Ltd | Liverpool | A rating |
| the invisible collection | London | A rating |
| The Iona Community | Glasgow | A rating |
| The IP Asset Partnership Limited | Oxford | A rating |
| The Iqra Centre | Bradford | A rating |
| The Irish Cricket Union Company Limited by Guarantee | Belfast | A rating |
| The Irish News | Belfast | A rating |
| The Ironing Board | Bucks | A rating |
| The Islamic Academy of Manchester | Manchester | A rating |
| THE ISLAMIC CENTRE OF ENGLAND | LONDON | A rating |
| The Islamic Cultural Centre Zakariyya Jaam'e Masjid | Bolton | A rating |
| The Islamic Diversity Centre | Newcastle upon Tyne | A rating |
| the islamic foundation | markfield | A rating |
| The Island | York | A rating |
| The Island Free School | Ventnor | A rating |
| The Island Quarter Careers Limited | London | A rating |
| The Island Surgery | Canvey Island | A rating |
| The Islington Chinese Association | London | A rating |
| The IT Admin Solutions Ltd | Epsom | A rating |
| The Italian Club Limited | Liverpool, | A rating |
| The Italian Room Limited | Hamilton | A rating |
| The Italian Shop | WESTERHAM | A rating |
| The James Hutton Institute | Dundee | A rating |
| The Japan Association of Marine Safety (London Office) | London | A rating |
| The Japan Foundation | London | A rating |
| The Japan Racing Association | London | A rating |
| The Japan Ship Owners' Mutual Protection and Indemnity Association | London | A rating |
| The Japanese School Limited | London | A rating |
| The Japanese Shipowners' Association(Office for Europe) | London | A rating |
| The Javan Coker Foundation | London | A rating |
| The Jerk Chicken Man Ltd | Hertford | A rating |
| The Jerk Valley of London Limited | London | A rating |
| The Jessop Medical Practice | Alfreton | A rating |
| The Jet Business (International) Limited | Weybridge | A rating |
| The Jewel In The Crown | Gwynedd | A rating |
| The Jewellery Display Company Ltd | London | A rating |
| THE JEWISH AGENCY FOR ISRAEL | LONDON | A rating |
| The Jewish Museum London | London | A rating |
| THE JIJI PRESS LIMITED | London | A rating |
| The Jo Richardson Community School | Dagenham | A rating |
| The John Fisher School | Purley | A rating |
| The John Innes Centre | Norwich | A rating |
| The John Lyon School | Harrow on the Hill | A rating |
| The John Muir Trust | Pitlochry | A rating |
| The John Wallis Church of England Academy | Ashford | A rating |
| The Joint Arab-British Chamber of Commerce | London | A rating |
| The Jolly Baker Enterprises Ltd | Ashford | A rating |
| The Jolly Coopers | Hampton | A rating |
| The Jones Family Practice | Hockley | A rating |
| The Jordans Ryvita Company a division of ABF Grain Products Ltd | Biggleswade | A rating |
| THE JOSHI CLINIC LIMITED | London | A rating |
| The Journey Church | Lisburn | A rating |
| The Journey of Learning Languages (JLL) Ltd | Sunderland | A rating |
| The Jubilee Academy | Harrow | A rating |
| The Jubilee street Practice Ltd | London | A rating |
| The Juice Plus+ Company Limited | London | A rating |
| The Juice Warehouse Ltd | Epping | A rating |
| The July UK Holdco Ltd | London | A rating |
| The Jungle Club (Vitaz Group) Ltd | Leicester | A rating |
| The Justice Platform Ltd (trading as Legl and CrowdJustice) | London | A rating |
| The Kabbalah Centre | London | A rating |
| The Kairos Initiative | Wirral | A rating |
| The Kalgidhar Trust | Greenford | A rating |
| THE KANDY KING LTD | Heston, | A rating |
| The Kandyan Restaurant Limited | Bristol | A rating |
| The Kantar Group Limited | London | A rating |
| The Karuna Trust | London | A rating |
| THE KATHMANDU LTD | RIPLEY | A rating |
| The Kati Roll Company Limited | London | A rating |
| The Kellan Group Limited | London | A rating |
| The Kendon Rope and Twine Co. Limited | Wakefield | A rating |
| The Kennet Crayfish Company Ltd | Thatcham | A rating |
| The Kensal Store Ltd | London | A rating |
| THE KENSINGTON CREPERIE LIMITED | LONDON | A rating |
| The Kensington Kindergarten | London | A rating |
| The Kent Autistic Trust | Gillingham | A rating |
| The Kenward Trust | MAIDSTONE | A rating |
| The Kerala | Reigate | A rating |
| The Kernow Consortium Ltd | Bodmin | A rating |
| The Keyholding Company Limited | London | A rating |
| The Keystone Company UK Limited T/A Kinorigo | Coventry | A rating |
| The Khan Partnership LLP | London | A rating |
| The Khukuri Ltd | Edinburgh | A rating |
| The Khyber BFD Ltd | Bradford | A rating |
| The Kids Food Company Ltd | St Albans | A rating |
| The Kidz Clean Kitchen Ltd | London | A rating |
| The Kilmarnock Football Club Limited | Kilmarnock | A rating |
| THE KINC AGENCY LTD | London | A rating |
| The King Alfred School | Dudley | A rating |
| The King Alfred Winchester Ltd | Winchester | A rating |
| The King and Queen | Southampton | A rating |
| The King's Castle Church | Newcastle upon Tyne | A rating |
| The King's CE School | Wolverhampton | A rating |
| The King's Church Durham | Durham | A rating |
| The King's School | Harpenden | A rating |
| The King's School | Canterbury | A rating |
| The King's School | Ely | A rating |
| The King's Trust International | London | A rating |
| The Kings Centre Southall | Southall | A rating |
| THE KINGSBOROUGH CENTRE | Uxbridge | A rating |
| The Kingsway Park Hotel | HYDE PARK | A rating |
| The Kinloch Hotel | Blackwaterfoot | A rating |
| The Kitchen Garden (Marton) Ltd | Skipton | A rating |
| The Kitchen of Multicuisine Limited | London | A rating |
| THE KITCHEN TAKEAWAY DARLINGTON LTD | Darlington | A rating |
| The Kite Factory | London | A rating |
| The Klinsmann Partnership Ltd | Bolton | A rating |
| The Knight Pub Company Ltd. | Cambridge | A rating |
| The Knight's Vault Ltd | Edinburgh | A rating |
| The Knoll Care Partnership Ltd | Manchester | A rating |
| The Knoll Nursing Home (Yeovil) Ltd | Yeovil | A rating |
| The Knowles Care Home | Coventry | A rating |
| The Koppers Care Limited T/A The Koppers Specialist Memory Care Home | Axminster | A rating |
| The Koppers Care Ltd T/A The Koppers Specialist Memory Care Home | Axminster | A rating |
| The Korea Development Bank London Branch | London | A rating |
| THE KOREAN CHURCH OF GLASGOW | GLASGOW | A rating |
| The Kortley Group Ltd | London | A rating |
| The Koyla Kitchen | Brierley Hill | A rating |
| THE KRAVE PERI PERI LIMITED | Hatfield | A rating |
| THE KSB BUILDING COMPANY LTD | Hayes | A rating |
| The KSL Clinic Limited | Edinburgh | A rating |
| The KT Boba Drink Limited | Belfast | A rating |
| THE L HUB LTD | LONDON | A rating |
| The L.S. Starrett Company | Jedburgh | A rating |
| The Lab Music Studio Ltd | London | A rating |