I've not read all the posts here so apologies if this has been posted.
I'm an ex farm worker. There needs to be a way to differentiate from farmers, landowners who rent to farmers, land owners that rent for or operate non-food and leisure uses, and people who own farm and woodland for tax breaks and couldn't care less about renting the land out to anyone.
For those who are likely to be saying it only affects a few, it depends on the part of the UK you are in, farmland prices and farmland supply varies across the UK as does the percentage of private non-farming investors and people buying up farms as a lifestyle choice but do not want to farm.
Also they need to stop classing equestrian use as agricultural use (Cameron/Osbourne thanks a bundle) and cap rents so it is no more profitable having liveries than it is renting to farmers.
Bring the land back into food production where possible. I used to ride and I live in a very horsey area, but half the fields are empty with no chance of persuading the land owners to stop trying to get 200-600 per month/horse or pony from a diminishing horsey crowd (horse and pony prices around here are cripplingly high). They wouldn't get anywhere near that a year/acre for farm rents.
When you think we were around 80% self sufficient in food in the 1980s and today around 60% self sufficient, we are in dire need of getting back to producing food before it gets worse. That also means getting the thumbscrews taken off food prices at the farm gate and finding savings though the packagers and processed food producers rather than off the farmers, but of course it is easier to screw over an individual SME than it is to tackle a giant processor and packager or supermarket.
Support UK grown food, is something no one should feel unreasonable about, we make some wonderful food.