| Morgan Sindall |
| £1.1 million |
| Heathrow |
| Aug 2019 |
| Mar 2020 |
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| Ferrovial |
| £336,000 |
| Heathrow Airport, London |
| Dec 2011 |
| Mar 2012 |
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| Ferrovial Agroman |
| £1,500,000 |
| Heathrow Airport, London |
| Aug 2012 |
| Jun 2013 |
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| Ferrovial Agroman |
| ongoing |
| Heathrow airport |
| Jan 2015 |
| Current |
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| Morgan Sindall |
| £329,000 |
| Heathrow Airport, London |
| Apr 2013 |
| May 2014 |
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