Company Index - W
- W B B Minerals - Sandbach
- W Christie & Co. Ltd. - Glasgow
- W H Tildesley Ltd. - Willenhall
- W Hawley and Son Ltd - Burton on Trent
- W Maass (Uk) Ltd. - St Helens
- W S Jenkins & Co. Ltd. - London
- Wade International Ltd. - Halstead
- Wainwright Associates Ltd - Bourne End
- Walker Filtration Ltd. - Washington
- Walport International Ltd - Reigate
Walsall Chemical Co (Metal Treatments) Ltd - Willenhall- Wam Contract Services Ltd. - Rochdale
- Warner-Lewis J R Industrie-Filter G M B H - Hook
- Warren-Morrison Valves Ltd. - Southampton
- Warwick International Ltd. - Holywell
- Warwickshire Oil Storage Ltd. - Tamworth
- Water Treatment Products Ltd. - Pontypool
- Waterlife Research Industries Ltd. - West Drayton
- Waterloo Quay Properties Ltd. - Aberdeen
- Waterloo Quay Properties Ltd. - Aberdeen
- Watermota Ltd. - Newton Abbot
- Watson Petroleum Ltd. - Wisbech
- Watson-Marlow Pumps Group - Falmouth
- Weatherford Completion Systems (Uk) Ltd. - Aberdeen
- Wefco (Gainsborough) Ltd. - Gainsborough
- Weidlinger Associates Ltd. - Glenrothes
- Weidmuller Ltd. - West Malling
- Weir Materials & Foundries - Manchester
- Wenaas - Aberdeen
- WERMA (UK) Ltd - Kettering
- Wessex Galvanizers Ltd - Eastleigh
- Wessington Cryogenics Ltd - Houghton le Spring
- Wessington Group Ltd. - Reading
- West Highland Gas - Oban
- West Special Fasteners - Dronfield
- Westbrook Welding Alloys Ltd. - Warrington
- Western Environmental - Bristol
- Westford Plastics & Engineering Ltd. - Wellington
- Westgate Fastenings - Great Yarmouth
- Westlakes Scientific Consulting Ltd. - Moor Row
- Wheelabrator Group Ltd - Altrincham
- Whitby Tanks Ltd - Whitby
- Whitchem Ltd. - Newcastle
- White Young Green plc - Salford
- Whiteley Read Engineering - Rotherham
- WhiteLight Design Associates Ltd - London
- Wickham Industries Ltd. - Leeds
- Wickham Laboratories Ltd - Fareham
- Willacy Oil Services Ltd. - Deeside
- William Blythe Ltd - Accrington
- Williamson-Dickie Europe Ltd - Radstock
- Winwood International Ltd. - Aberdeen
- Wirecloth Sales and Development Ltd - Warrington
- Wirral Fospray Ltd. - Deeside
- Witham Oil & Paint Ltd - Lincoln
- Witton Chemical Co Ltd - Bury St Edmunds
- Woburn Chemicals Ltd. - Milton Keynes
- Wockhardt UK Ltd - Wrexham
- Wolseley Ltd. - Reading
- Wood Group Pressure Control Ltd. - Peterhead
- Woodfield Systems Ltd. - Whitstable
- Woodville Polymer Engineering Ltd - Swadlincote
- Worldwide Oilfield Machine (U K) Ltd. - Aberdeen
- Worldwideworker.com - London
- Worleyparsons Europe Ltd. - Brentford
- Worlifts Ltd - Bromsgrove
- Wright Engineering Co (Stratford-upon-Avon) Ltd - Stratford upon Avon