If the British left: Agricultural policy outside the CAP?

If the Conservative party wins Britain's General Election in 2015 the incoming Government intends to negotiate a new settlement with the EU, and then hold an in-out referendum. Opinion polls suggest a narrow majority would vote to leave. To exercise an informed choice the electorate would need to know what feasible alternatives are available, so that these can be assessed and debated. Furthermore, in the event of a No vote the Government must be ready to implement its alternative strategy: Plan B. This implies that both a new EU settlement, and Plan B, need to be negotiated concurrently. There has been no serious attempt to explain what Plan B would mean for UK farm policy. Would, for example, British farmers continue to receive the level of support that they currently enjoy; would support be more focussed on environmental objectives? WTO rules on most-favoured-nation treatment and regional trade agreements would apply. Could a WTO compatible agri-food trade agreement be negotiated with its former EU partners, or would Irish and Brazilian beef face the same tariff barriers on imports into the British market? For the EU, the loss of a major net contributor to EU finances could result in a re-examination of the CAP budget.