Hugh please do not be offended, and please correct me if I am wrong, but are Farmers not subsidised by the EU? and if this is the case if I was in that position my views would be somewhat different.
My views are that we as a nation should be able to choose and have control of what happens in this country (that's why we have a voting system) and how we control our borders. We are controlled to a certain degree on how our economy is run, and if it doesn't work out we have to be able to hold our hands up and admit it, some (not all) the decisions by the EU have not taken UK's best interests into consideration. Is it time for a change? We will see. Some of the things that go on are deplorable, production all over the UK have shut their doors and the operations moved to Europe because they can import it cheaper, is this a fair way of trading? With my work we contract for a Blue Chip company, who had a thriving business within the UK, incentives and subsidies meant that the company could still produce the goods but cheaper outside of the UK, we receive on average 10,200 tons of goods per month from all over Europe into our warehouse (A trivial amount in the bigger picture) but it secured 400 jobs, this used to all be produced in the UK. This is now transported by road at a cost of £132 per ton that's over 16 million pound in transport costs per year alone which would pay 400 UK workers £40,000+ per year wages all paying tax, and all these goods are destined for the UK market place does this make sense?
It may be worse or it may be better only time will tell, but if we do or we don't leave it must be a decision by the country as a whole and people should be able to express opinions freely after all Its our money that pays for it.