The Lean Micro Farm

I wouldn't buy his books either (unless it was cheap!). He seems to have run a Community Supported Agriculture scheme (which I take to mean a Veg Box sort of thing) on his 3 acres. Reading between the lines, he has reduced the variety of crops he previously grew on 3 acres to the ones that his customers liked most which he can grow on a third of an acre.
He sounds a bit like Charles Dowding, grows a small area of mainly salad crops to sell locally but makes an income from books, courses, talks and other spin offs.
I've met a few people who grow for veg box schemes. They all struggle in the hungry gap. The Local chap I visited last year buys in organic spuds and other stuff during the off season as he can't grow enough on his small plot. He has diversified though by setting up a small market stall where he sells direct at weekends as well as delivering his veg boxes.