I have been asked to reply.
My right hon. Friend has made no such estimate. However, the Carbon Trust (CT) offers energy efficiency advice and surveys in respect of all agricultural sectors including horticulture, and the pig and poultry industries, and publishes a wide range of advice on their website with self help guidance and fact sheets including specific sections for:
In 2007-08 CT also funded the Grow Save programme—run by the Horticultural Development Board—which helps growers reduce the energy consumption of greenhouses.
These activities were funded by Carbon Trust's core government grant as well as other sources of income