Company Index
- IAC Plastics - Burnley
- IACS Corrosion Engineering Ltd - Keston
- Ian Black - Tranent
- Ian Flockton Developments Ltd - Grimsby
- Ian Walker Associates - Guildford
- IAS Marketing and Communication plc - Macclesfield
- IBC Recovery Services Ltd - Middlesbrough
- Ibstock Brick - Bristol
- icenta Controls Ltd - Salisbury
- Icheme - London
- ICI Group plc - London
- ICI Imagedata - Manningtree
- ICS Triplex - Maldon
- Ideal Manufacturing Ltd - Wellingborough
- IEC Ltd - Poole
- IFS Group - Industrial Foam Systems Ltd - Kings Lynn
- IHS Energy - Epsom
- IKV Tribology Ltd - Monmouth
- IMA Ltd (International Moisture Analysers) - Leeds
- Image Chemical Products Ltd - Accrington
- IMI Bailey Birkett - Manchester
- IMM Bond Ltd - Felixstowe
- Imperial Tube and Fitting Ltd - Ashford
- Impress Sensors and Systems Ltd - Aldermaston
- IMTEX Controls Ltd - Tonbridge
- In House Gas - Glasgow
- In-Situ Oilfield Services - Aberdeen
- Increased Oil Recovery Ltd - Aberdeen
- Indestructible Paint Ltd - Birmingham
- Index Marine Ltd - Poole
- Industrial Chemical Supplies - Plymouth
- Industrial Chemicals Ltd - Stevenston
- Industrial Cooling Systems - New Milton
- Industrial Design Ltd - Kidlington
- Industrial Flow Control Ltd - Grays
- Industrial Latex Compounds Ltd - Heywood
- Industrial Refrigeration Systems Ltd - Bicester
- Industrial Solutions UK Ltd - Bromley
- Industrial Waxes - Tonbridge
- INEOS Chlor Ltd - Runcorn
- Infield Safety - Haverhill
- Infield Systems Ltd - London
- Infineum UK Ltd - Abingdon
- Influx Measurements - Alresford
- InfoScape Solutions Ltd - Guildford
- Ingen Ideas Ltd - Aberdeen
- Innova Biosciences Ltd - Cambridge
- Innovata Ltd part of the Vectura Group - Nottingham
- Inoxia Ltd - Guildford
- Inpharmatica Ltd - London
- Inpipe Products - Leyburn
- Inserve Ltd - Southampton
- Insit Moulded Packaging Ltd - Trowbridge
- Inspection Consultants Ltd - Ellesmere Port
- Inspectorate International Ltd - Witham
Institution of Chemical Engineers - Rugby- Instrument Product Services Ltd - Poole
- Instrument-Net - Richmond
- Instrumentation Systems and Services Ltd - Ilkley
- Intachem Ltd - Lowestoft
- INTEC Engineering (UK) Ltd - Woking
- Integral - Newcastle upon Tyne
- Integrale Systems Ltd - Swindon
- Integrated Scientific Ltd - Rotherham
- Intercoat Industrial Paints and Lacquers Ltd - Walsall
- Interflon (UK) Ltd - Stockton on Tees
- Interfoam Ltd - Bedford
- Interglass Technologies Ltd - Sherborne
- International Biotech - London
- International Cable Management Ltd - Aberdeen
- International Flavours and Fragrances Ltd - London
- International Gas Apparatus Ltd - Yateley
- International Paint Ltd - Gateshead
- International Pipeline Supplies Ltd - South Shields
- International Safety Products Ltd - Bootle
- International Scientific Supplies Ltd - Bradford
- Interpak - High Wycombe
- Interspiro Ltd - Telford
- Intertec Instrumentation Ltd - Verwood
- Intertek Caleb Brett - Avonmouth - Bristol
- Intertek Caleb Brett - Grangemouth - Grangemouth
- Intertek Caleb Brett - Immingham - Immingham
- Intertek Caleb Brett - Ipswich - Ipswich
- Intertek Caleb Brett - Merseyside - Ellesmere Port
- Intertek Caleb Brett - Teesside - Middlesbrough
- Intertek Caleb Brett - West Thurrock - Grays
- Invensys Simsci Ltd - Stockport
- INVISTA Performance Technologies - Redcar
- INYX PHARMA - Runcorn
- IOES Ltd - London
- IonBond Ltd - Consett
- IPC Systems Ltd - Worcester
- IPU Group - Oldbury
- Ironsides Lubricants Ltd - Stockport
- Isaa - Kidderminster
- Isca UK Ltd - Newport (Gwent)
- ISF Group Ltd - Leicester
- ISL Ivan Semenenko Ltd - Moreton in Marsh
- Isotek Electronics Ltd - Leeds
- Isothane Ltd - Accrington
- Isothermal Technology Ltd - Southport
- ISP Alginates UK Ltd - Girvan
- ISP Ltd - Tadworth
- IST Molchtechnik GmbH - Patented Pigging Systems - Deeside
- Isys International Ltd - Winsford
- Itac Ltd - Manchester
- ITS Drilling Services - Aberdeen
- ITT Water and WasteWater UK Ltd - Livingston
- ITW Devcon - Wellingborough
- Ivex Pharmaceuticals - Larne
- IX Survey Ltd - Edinburgh
