No, I didn't. I don't know where in Liverpool you lived, but there weren't many fruit farms in my part of Merseyside. I would have been nowhere near as efficient as an experienced fruit/veg picker anyway. I did have a Saturday job in a shop though.
Callistemon I agree with you. The accommodation looked well organised and, in normal circumstances, would be adequate. I think that the sleeping arrangements with two beds in a small room would be a problem. Maybe the grower should have arranged extra accommodation, but that of course would push the price up and make the crops uncompetitive. All growers would need to be forced to do it. No worker should be forced into potentially unsafe working conditions.
As far as the wages are concerned, the workers weren't being exploited. They were being paid the minimum wage for what is admittedly very hard work.
The ones who would concern me are those recruited abroad and being paid by agencies, who are sometimes paid below the minimum wage. The country needs more "red tape" to crack down on gang masters. I suspect there are some people who don't care very much about "furriners" (from all countries) being exploited, so have turned a blind eye.