1. French motorways link Spanish border with Calais(1970s)

2. No high-speed refrigerated lorries until 1980s

4. Channel Tunnel and larger ferries – easier cargo transport across the Channel (1990s)

8. Cheap labour needed to help farmers

9. Spain building motorway up east coast to France (1990s)

10. Sunshine always available. Needed other factors before it was any use

11. Plastic and steel frame greenhouses invented: cheap, easy to put up, stop evaporation (1990s)

12. British shoppers demand fresh fruit and veg all year at low prices (1980s)

14. Spain starts drilling for underground water supplies in 1960s