The M4 corridor is an area in the United Kingdom adjacent to the M4 motorway, which runs from London to South Wales. It is a major high-technology hub. Important cities and towns in the area include Basingstoke. Bath, Bracknell, Bristol, Cardiff, London, Maidenhead, Reading, Newbury, Newport, Slough, Swansea and Swindon. The area is served by the M4 Motorway, the Great Western Main Line, including the South Wales Main Line, and London Heathrow Airport. Technology companies with major operations located in the area include Citrix Systems, Dell, Huawei, Lexmark, LG, Novell, Nvidia, Panasonic, SAP and Symantec.
The eastern end of the English M4 corridor is home to a large number of technology companies, particularly in Berkshire, Swindon and the Thames Valley. For this reason this part of the M4 Corridor is sometimes described as England's "Silicon Valley". Slough, Windsor, Maidenhead, Reading, Bracknell and Newbury are the main towns in the Berkshire stretch of the M4.
Reading is home to many information technology and financial services businesses, including Cisco, Microsoft, ING Direct, Oracle, Prudential, Yell Group and Ericsson. Vodafone has a major corporate campus in Newbury, O2 plc is in Slough and the headquarters of Hutchison 3G UK are in Maidenhead.
Investment has gradually spread westwards since the 1980s. In the west the interchange of the M4 motorway and M5 motorway at the Almondsbury Interchange near Bristol had seen considerable growth of industries by the mid 1990s, in adjoining areas.
The major Welsh cities along the M4 corridor are Cardiff, Newport and Swansea. South Wales is an industrial heartland of the UK. The 1980s and 1990s saw the development of the Swansea Enterprise Park. The Celtic Manor Resort located adjacent to the M4 in Newport has undergone significant investment and successfully hosted the 2010 Ryder Cup. Newport has seen significant growth in the electronics industry since the late 1980s and is home to factories for electronics firms such as Alcatel. The 1990s also saw significant investment in Cardiff such as in Cardiff Gate and the Cardiff Bay area. One site of note on the M4 Corridor is Port Talbot Steelworks - the largest steel producer in the UK and one of the biggest steel producers in Europe.
The opening of the Second Severn Crossing in 1996 resulted in the previous M4 and bridge, serving Chepstow, being renumbered the M48, although the area is still generally considered as falling within the M4 corridor.
Since the start of the 21st Century there has been evidence of more investment west of Cardiff, such as:
- Port Talbot
- Cross Hands
See also 
- Rowley, Trevor (2006). The English Landscape in the Twentieth Century. Continuum International Publishing Group. p. 47. ISBN 1852853883, 9781852853884 Check
|isbn=value (help). Retrieved 12 March 2012.
- Norfolk Council economic report
- "Tech Map of Britain: M4 corridor". The Telegraph. 3 November 2010. Retrieved 7 November 2010.
- "Britain's science corridor". The New York Times. 24 April 1983. Retrieved 7 November 2010.
- The Telegraph - Tech Map of Britain: M4 corridor
- Microsoft UK Headquarters, Reading
- ING Direct UK HQ
- Oracle UK HQ
- Prudential UK locations
- Yell Group HQ
- Ericsson UK Sites
- BBC - Vodafone moves world HQ to London
- Business Interiors - Flexible Working Pilot for O2 Head Office
- Hutchison 3G office locations
- OHRU Thames Valley to Silicon Valley and the M4 Corridor
- Bristol Economic Assessment March 2011
- http://www.historylearningsite.co.uk/wales_and_devolution.htm History Learning Site - Wales and devlolution
- Swansea Council - Business
- Celtic Manor Resort - History
- 2010 Ryder Cup - Europe
- Newport Economic Development Strategy 2003 - 2008
- BBC News - Workers hope as billionaire sells firm
- BBC News - Bay investment is 'obscene' says MP
- WAG News 2005 - Port Talbot’s new £80m Steel Caster officially opens
- Creating Media
- Capital Wales
- BBC News - Neath Port Talbot council investing in Aberavon Beach
- NPT - Baglan Energy Park
- Metro - Amazon to create hundreds of jobs
- Swansea Docks - History
- CCS - Development
- Llanelli Gate
- Carmarthenshire Council - Strategic Sites
- Llanelli Waterside
- News Wales - New Wales racecourse goes flat out