Re: Mean while, back in the real world...
CAP is expensive because the UK government vetos any changes to it. Basically in the UK most farming is done by half a dozen conglomerates they aren't based in farmhouses they are working out of swish London offices. These companies gobble up 90% of the CAP subsidies. The EU have proposed a limit on the subsidy that any farmer can get. So that there is a cut off at say £30-50K which would benefit the small farmer but screw over the big companies. The UK has always opposed such changes, moving out of the EU would not reduce the amount of subsidy, the UK government would simply pay it directly to their city mates.
Part of the expense of CAP is the use of set-aside to give over some of the land to preserve wildlife insects like bees and wild flowers. You can reduce the cost of CAP if you give those up and allow persistent pesticides to be sprayed across the country.