Jonathan: All this talk of seaweed – and foraging generally, has led me to search our bookshelves for our copy of Food for Free. Originally published in 1972, Richard Mabey’s classic, ground-breaking foraging guide has never been out of print since, and has gone through many editions. Mine is a first edition, and would be worth up to £100 – were it not for the gift/owner inscription and the missing dust jacket.  However the gift inscription is that of my Dad to my Mum on her birthday, and that’s where the value lies for me. This was my Mum’s book, and has all the character that comes from more than 30 years of familiarity. And now I reckon there’ll be many years more of use in our own time.