I buy samphire from the village market, the fish van sells it. I live in Suffolk, though, so it doesn't travel very far. I don't think it will disappear, much of it grows in fairly inaccessible places. It's very salty, so best soaked first a couple of times, and kept in water it lasts for maybe four or five days, if you change the water every day. I think agonising over something and worrying in case it is ethical is a very middle-class trait, so maybe people will stop eating it anyway, which will solve the problem.
Anyone who worries constantly about whether they are doing 'the right thing' a la Hyacinth is wasting their life. Grayson Perry's programme on channel 4 was perfect. It was called 'In the Best Possible Taste' and had the classes perfectly defined (in my opinion). I can't believe I used to spend a whole day polishing all the blasted silver I inherited, twice a year. But now I don't think anyone would know or care where I came from, my cockneyish ex-husband got rid of the plum in my mouth and I am no stranger to second hand clothes shops, I have friends from all walks of life and I think that, for most people, the class distinctions have blurred so much as to be invisible. But here is a link to a few minutes of the 'lower middle class' section of his series, if anyone is interested.
http://www.channel4.com/programmes/in-the-best-possible-taste-grayson-perry/video/series-1/episode-2/s1-ep2-the-middle-class
My son goes to a private school, and sometimes I watch the odd aspirational mummy and just laugh and wonder how long it took them to get ready for doing the school run. Then curse them as they take up two spaces in their huge minibus-sized cars. On the whole though, most of the parents are struggling with fees just as much as we are, and are not paying out fees to try to raise their child's class (impossible now in a private school anyway), but to try to solve learning problems, or to board them because of having to move around so much for work.
I appear to have written an essay!