I have some spare Morina longifolia seed that I'd be happy to post to anyone in the UK who'd like to grow it. I'm aware that seed and plants are widely commercially available, so I'm not expecting anything in return - I'm making the offer simply because I don't like seeing seed go to waste when someone else might appreciate it. If you do collect seed, I'd be delighted to receive more or less anything I stand a reasonable chance of being able to grow in South Yorkshire in exchange, however common.