There has been a lot of talk lately about the shamefully low prices that supermarkets pay to dairy farmers - well below what it costs them to produce the milk. While supermarkets use milk as the chief weapon in their price wars, the losers are the farmers, who struggle to survive.In fact, there are now only about a third the number of UK dairy farms that there were 20 years ago. The total has fallen from over 35,000 in 1995 to less than 14,000 now (according to AHDB Dairy, quoted in the Guardian).