I like that! Pork with hairs on indeed!

Hope you don't mind me tagging on here as it isn't a proper supermarket rant. However, I hate buying eggs from the supermarket as I'm never sure where they came from and they're so expensive. I used to buy a tray of 20 XXXL (usually double-yolkers) hens eggs from our farmshop for £3.50 and they were delish! However, since moving, I haven't found anywhere that sells decent free-range eggs and have been paying £1.29 per half dozen from Sainsbury, and they're nothing special. There's no farmshop near us (our nearest was recently bought and so far hasn't re-opened - whether or not it will, I don't know, but here's hoping) and I haven't found anywhere on the side of the road, as it were. That is, until today! There was a sign saying 'free range eggs', so I pulled in. There was a huge pen in a field with chickens grazing and an honesty box. Basically they're charging 50p per half dozen, which doesn't seem at all bad to me.
What I want to know, is whether this is good or not. The chooks seemed happy enough and seemed to have plenty of space. Haven't tried the eggs yet, so couldn't comment. Are there specific requirements chook people have to follow in order to call their eggs free-range?