Ric - it's impossible to know if a subsidy of £26K represents a living wage for a farmer, or a drop in the ocean of the debts being incurred by this situation - I suspect that there is no hard and fast way of measuring the impact.
From what I read and hear, this is a global market downturn, and the notion of farmers taking milk off supermarket shelves is not remotely helpful - although it is easy to understand their frustration, and desire to be seen to be doing something to make their views known.