| H. & J. Jordan | Craigavon | 1942 |
| H. & M. (Farmers) Limited | Newton Abbot | 1972 |
| H. & R.E. Lindley Limited | Epworth | 1963 |
| H. & S. ROE & Sons Farms Limited | South Hykeham | 1985 |
| H. Adamson & SON (Farmers) Limited | Newport On Tay | 1972 |
| H. Barker (Timber & Transport) Limited | Grange Over Sands | 1979 |
| H. Bradley & Sons (Produce) Limited | Alford | 1956 |
| H. Burnett & Sons Limited | Boston | 1953 |
| H. Casswell and SON (Gosberton) Limited | Spalding | 1952 |
| H. E. Dennis Farms Limited | Sudbury | 2007 |
| H. Garside & SON (Agents) Limited | Huddersfield | 1988 |
| H. Garside & SON (Farmers) Limited | Huddersfield | 1976 |
| H. H. James & SON Limited | Scunthorpe | 1955 |
| H. Irwin Limited | Diss | 2003 |
| H. Jagger (Poultry) Limited | Nottingham | 1976 |
| H. O. Champneys Limited | Tunbridge Wells | 1955 |
| H. Padfield (Ongar Farms) Limited | Witham | 1986 |
| H. Padfield and Sons Limited | Ongar | 1986 |
| H. Prins Limited | Wisbech | 1930 |
| H. Wareing and Sons Limited | Southport | 1962 |
| H.& L.Kerley & Sons Limited | Blandford Forum | 1955 |
| H.A. Harris Farms Limited | Sherborne | 1973 |
| H.A. Lambert (Farmers) Limited | Hull | 1953 |
| H.A.Butler & SON Limited | Milton Keynes | 1960 |
| H.A.Colburn and Son(Holdings) | Cheltenham | 1962 |
| H.A.Welch (Yelland) Limited | South Molton | 1944 |
| H.A.Whittemore Limited | Neston | 1946 |
| H.And D.Bartlett(Iwerne Minster)Limited | Near Salisbury | 1954 |
| H.B. Equestrian Limited | Banbury | 2013 |
| H.B. Johnson & Co. Limited | Hull | 1978 |
| H.B.S. Farms (1995) Limited | Norwich | 1995 |
| H.Barr & Sons Limited | Newbury | 1956 |
| H.Bunting Limited | Beds | 1947 |
| H.C. and J.F. Jordan Limited | Gloucester | 1997 |
| H.C. Grimes & SON Limited | Newton On Trent | 1964 |
| H.C. Sprinz (Farms) Limited | East Yorkshire | 1964 |
| H.C. Swayne & Sons Limited | Westbourne | 1956 |
| H.C.C.Tinsley & SON Limited | Lincs | 1958 |
| H.C.Edwards and Sons Limited | Brecon | 1960 |
| H.C.Percival (Farms) Limited | Colchester | 1953 |
| H.C.Webber & SON Limited | Taunton | 1961 |
| H.Collington & Sons Limited | Loughborough | 1956 |
| H.D. Cobbald and Sons Limited | Essex | 1948 |
| H.D. Paul & Sons Limited | Ross-Shire | 1965 |
| H.E. Alston (Bradfield) Limited | Norwich | 1982 |
| H.E. Kinch (Thameslade) Limited | Berwick Upon Tweed | 1962 |
| H.E. Smith & SON Nurserymen (Essex) Limited | Chelmsford | 1972 |
| H.E.Andrews & Sons Limited | Pewsey | 1961 |
| H.E.Hall & SON Limited | Kent | 1957 |
| H.F. Hart Limited | Gloucestershire | 1973 |
| H.G Waggett & Sons Limited | Malvern | 1944 |
| H.G. KEW (Bank Farm) Limited | King'S Lynn | 1964 |
| H.G. Robinson & Sons Limited | Milton Keynes | 1982 |
| H.G.Millard Limited | Shefford | 1946 |
| H.G.Tincknell Limited | Taunton | 1957 |
| H.G.Tompsett & Sons Limited | Maidstone | 1957 |
| H.G.Tunnard Limited | Boston | 1961 |
| H.Gingell Limited | Cambridge | 1954 |
| H.Godden Tree Surgery Limited | Ashford | 2006 |
| H.Goodall & SON (Farmers) Limited | Lymington | 1957 |
| H.H. Robson and Company | Kelso | 1959 |
| H.H.Cawston & Son,Limited | Bury St Edmunds | 1950 |
| H.I. Rowlands Co Ltd | Wales | 2001 |
| H.I.Muddle & SON Limited | Tonbridge | 1957 |
| H.J. Haggas & SON Ltd | King'S Lynn | 1955 |
| H.J. Shuttleworth and SON Limited | Horncastle | 1954 |
| H.J. Warder Limited | Chelmsford | 1979 |
| H.J.C.W Limited | Winchester | 2012 |
| H.J.Skinner Limited | Kent | 1950 |
| H.J.Summerfield(Maulden)Limited | Maulden | 1956 |
| H.Jefferson(Gringley)Limited | Gainsborough | 1958 |
| H.Knowles-Brown Limited | Chesham | 1947 |
| H.L. (Pigs) Limited | London | 1980 |
| H.L. Hutchinson Limited | Wisbech | 1947 |
| H.L. Stewart of Struthers Limited | Cupar | 1960 |
| H.L.Sainsbury & Sons Limited | Swindon | 1961 |
| H.M. Dale (Farmers) Limited | Nr. Louth, | 1953 |
| H.M. Heywood & Sons | Wells | 1970 |
| H.M. Partridge & Co. Limited | Ipswich | 1997 |
| H.M. Pattullo & Co. | Perthshire | 1955 |
| H.M. Renwick Limited | Marlborough | 1977 |
| H.M. Venn & Sons Limited | Sleaford | 1983 |
| H.Mount & Sons Limited | Canterbury | 1946 |
| H.Mustin & SON Limited | Sturminster Newton | 1939 |
| H.N. Butler Farms Limited | Petersfield[Hampshire | 1955 |
| H.Nicholson Contracting Ltd | Carlisle | 2025 |
| H.P. Bramhill & Company Limited | Scunthorpe | 1950 |
| H.P. Cooper (Farms) Limited | Essex | 1958 |
| H.P. Renwick (Chilgrove) Limited | Chichester | 1964 |
| H.R Bourn & Sons (Linwood) Limited | Market Rasen | 1999 |
| H.R. Driffill & SON Limited | Selby | 1960 |
| H.R. Fell and Sons Limited | York Yorkshire | 1978 |
| H.R. Philpot & SON (Barleylands) Limited | Billericay | 1964 |
| H.R. Philpot & SON (Great Hayes) Limited | Billericay | 1955 |
| H.R. Philpot & SON (Holdings) Limited | Billericay | 1987 |
| H.R. Smith & SON Limited | Lincolnshire | 1946 |
| H.R.Lyne & SON Limited | Helston | 1963 |
| H.R.S. Farm Limited | Addingham Moorside,Ilkley | 1991 |
| H.Riding Limited | Nr.Chorley | 1966 |
| H.S. Drummond (Glenside) Limited | Stranraer | 1960 |