Golden Samphire (Limbarda crithmoides)
On our many trips to the Thames Estuary, this is a plant I have taken many photos of. It's bright yellow with yellow green succulent leaves and grows in large tufted clumps all over the area.
Wikipedia says that it only grows on the Isle of Sheppey in the UK. This isn't right, as when you google it, you find it grows in Wales and Dorset at least. However, that said, it is prolific on Sheppey but also on the other side of the Thames Estuary around All Hallows and on the Isle of Grain.