Rock samphire is also flowering now, and although it is said that it is better before this, there are still plenty of fresh leaves to be had. To my uneducated palate, the two samphires taste quite similar.
Richard Maybey warns, however, to wash plants from such places carefully, as "the bushy clumps that they grow in are often the only prominent vegetation along coastal paths and sea walls, and are ideal targets for perambulating dogs".
Glasswort (or marsh samphire) has appeared in small quantities this year, so is not being picked (apart from a little nibble occasionally). It is probably best pickled when found in good quantities.
So far as I know, annual sea blite is not edible, but is thriving in the pools by the sea wall.
Sea holly - its root was a delicacy, but not to be confused with the root of yellow horned poppy, which brings hallucinations.