I've watched all of this short series(four programmes) - I find Simon Reeve an engaging character.
Whether you are interested in the series or not, can I encourage you to watch the final programme (5:30pm today BBC 2 and on iplayer). Simon Reeve visits Almeria which has a huge area covered by 'greenhouses'. Apart from the effect that has on the area the working conditions are appalling.
I found it something to think about the next time I was buying vegetables.