You'd be surprised - corporations still only
own quite a relatively limited amount of UK land (far less than the fecking aristocrats and nouveau riche), which is often for land banking purposes rather than agriculture-centric. That sort of land is often leased by smaller concerns.
Farming specifically is still a fairly mixed bag of owned and rented (
source):
With 54% being owner-occupied, 14% tenanted and 31% mixed-tenure. It's difficult to find stats on this stuff, particularly on who
ultimately owns a given piece of land or is profiting off farming it, but it's not as fully multinational corpo as is sometimes portrayed. Savills
reckons there's 194,000 farms in the UK with only 20% of those being 250+ acres and more than half being less than 50, smaller tending to be more likely family-run. Only 1/5th of farms make a profit greater than £75k p/a. Around 6% of farms are signed up with the various co-ops. So somewhere in there seems to be an intimation that there is still a reasonably sizeable independent farming sector, but it's in decline (and old - something like 70% of farm owners are aged 55 or over).
Loads of useful stats here about the industry at large. There's also a
really useful survey by the Welsh Government which is obv specific but can probably also be considered indicative. It notes:
The 2019 June Agricultural Survey in Wales estimated a total of 24,807 farms. The majority (14,658, 59%) of these are classed as VS in terms of economic size; a further 6,943 (28%) are classed as S (Figure 2). Together these VS&S farms account for almost 9 out of 10 Welsh farms and thus the overwhelming majority of households operating farms fall into these size classes. This fact makes them of great importance to societal and political issues. However, because these farms are small in economic terms, they account for a relatively minor proportion of the estimated turnover from farming in Wales; VS farms contribute €101 million (5%) and S farms €415 million (22%) to the €1,906 million total.
Which would suggest the bigger landowners (presumably including medium-sized farms and up, as well as outfits like the National Trust) and agri-corps are generating the other 73% of income I guess?