Engineering Company Index - H
- H & E Knowles (Lye) Ltd. - Cradley Heath
- H & K (Industrial Services) Ltd. - Birmingham
- H & R Oakley (Engineering Services) Ltd. - Carshalton
- H Armstrong Ltd. - Carlisle
- H Blackhall Engineering (Scotland) Ltd. - Edinburgh
- H Case & Son (Cradley Heath) Ltd. - Cradley Heath
- H Kuhnke Ltd. - Andover
- H & B Boiler Servicing - Westerham
- H & D Worm Drive Clips (1965) - London
- H & E Engineers (Holdings) Ltd. - Kidlington
- H & H Engineering Blaenavon Ltd. - Pontypool
- H & M Disinfection Systems Ltd. - Northwich
- H & M Plating Co. Ltd. - Redditch
- H & M Services - York
- H & P Polishing - Birmingham
- H & P Precision Uk Ltd. - Lichfield
- H & R Boilercare Ltd. - Hoddesdon
- H & R Fabrications & Finishers Ltd. - Waterlooville
- H & S Aviation Ltd. - Portsmouth
- H & S Plumbers Merchants Ltd. - Blackburn
- H & V Commission Services - Galston
- H 4 Marine Ltd. - Yelverton
- H and B Pressings - Driffield
- H and C Moore Ltd - Leeds
- H and G Systems Ltd - Broxburn
- H and H Products Ltd - Halesowen
- H and I Engineering Ltd - Annan
- H and J Speake Ltd - Willenhall
- H and M Beaumont Engineering - Driffield
- H and S Engineering - Kings Lynn
- H B Humphries & Co. Ltd. - Kettering
- H B Tools (Ormskirk) Ltd. - Ormskirk
- H C Lazell (Lashings) Ltd. - Grays
- H C Turk (Engineering Services) Ltd. - Gravesend
- H C M Engineering Ltd. - Stourbridge
- H C S Services - North Shields
- H Cooper and Sons (Bristol) Ltd - Yate
- H D Bearings & Engineering Supplies Ltd. - Airdrie
- H D Simpson & Co.(Polishers) Ltd. - Smethwick
- H E Marfleet - Alford
- H E C (Precision) Ltd. - Southall
- H E S Engineering Services Ltd. - High Peak
- H E Woolley Ltd. - Middlesbrough
- H F Bates - London
- H Fereday and Sons Ltd - Harlow
- H G Trading (Northern) Ltd. - St Helens
- H G Kippax & Sons Ltd. - Huddersfield
- H G P Precision Ltd. - Wolverhampton
- H Goodwin (Castings) Ltd. - Walsall
- H Hipkiss & Co. Ltd. - Birmingham
- H I E Ltd. - Prestwick
- H I Services Ltd. - Maidstone
- H J Heating and Plumbing - Northwood
- H J Weir Engineering Co. Ltd. - Chepstow
- H L Hazeltine (Aveley) Ltd. - South Ockendon
- H L Hutchinson Ltd. - Ledbury
- H Lehmann Ltd - Stoke on Trent
- H M & J M Parrott - Bedford
- H M Machinery Uk Ltd. - Rochester
- H M R Engineering - Clitheroe
- H Malone and Sons Ltd - Newcastle upon Tyne
- H Mullins (Earby) Ltd. - Jarrow
- H Norman - Nottingham
- H O B Ltd. - Hamilton
- H P C Services Ltd. - Ilkeston
- H P Card and Son - Bristol
- H P F Energy Services - Ellesmere Port
- H P Inman & Co. Ltd. - Burnley
- H P Mouldings Ltd. - Tenbury Wells
- H P W Engineering - Darwen
- H Pickup Mechanical & Electrical Services Ltd. - Scarborough
- H R Fire & Safety Ltd. - Leeds
- H R Smith (Technical Developments) Ltd. - Hereford
- H R Adcock Ltd. - Loughborough
- H R Engineering - Woodbridge
- H R S Motorcycles - Bristol
- H R S Services Ltd. - Sheffield
- H R Thompson & Sons - Dudley
- H Ripley and Co - Hailsham
- H Ripley and Co - Hastings
- H S Pitt & Co. Ltd. - Halesowen
- H S C Mobility Ltd - Hayle
- H S M (U K) Ltd. - Burntwood
- H S Peplow & Son Ltd. - Leeds
- H Sly & Sons - Spalding
- H T Fabrications Ltd. - Leicester
- H T Consultants - Aldershot
- H Tipton-Jones & Co. Ltd. - Salford
H Varley Ltd - Altrincham- H W Comery Ltd. - Perth
- H W Engineering (Wigan) Ltd. - Wigan
- H W Webb (Engineers) Ltd. - Bungay
- H W Whiteley Engineering - Halifax
- H Wicks (Lindal) Ltd - Barrow in Furness
- H Woods & Son - Belfast
- H. Downs & Sons (Huddersfield) Ltd - Huddersfield
- H. J. Enthoven Ltd - Matlock
- H.A.Mason(Metals) Ltd - Brierley Hill
- H.M.B. Machinists & Engineers Ltd - Alfreton
- H/T Ltd. - Portland
- H20 Europe Ltd. - London
- HA England (Engineers) Ltd - Bolton
- Haas Automation Ltd - Norwich
- Habit Diamond - Lichfield
- Habrough Fabrication Welding Services Ltd. - Immingham
- Hacel Lighting Ltd. - Wallsend
- Hacketts Pipeline - West Bromwich
- Hackney Christopher - Warrington
- Had-Fab Ltd. - Tranent
- Haddon Craft Forge - Northampton
- Haddon Special Steels Ltd - Dronfield
- Haden Freeman Ltd - Manchester
- Haden Geoffrey P - Swansea
- Hadham Ltd - Bishops Stortford