Hay and corn prices used to feed dairy cattle have doubled because of the rising demand for corn to ferment to make ethanol, the biofuel.

The centre will meet rising demand and a surge in independent businesses selling on its platform and using its warehousing and delivery services.

For example, the ageing population and growing middle class around the world will ensure a rising demand for medical supplies and treatments.

Energy firms have a strong presence again in this year's league table, reflecting rising demand and high prices over the period.

This new source of competition could be an irritation for landlords of the long-term variety who have been enjoying rising demand and returns for their services.