Ray's Knotgrass - Polygonum oxyspermum
Note: Small stipules green/brown in colour and a few slightly in-rolled leaves.
Sea Knotgrass - Polygonum maritimum
(Hayling Island Hants 2015)
Note: Very conspicuous white stipules, longer than internodes with many veins and glaucous leaves heavily in-rolled.
Also today I spent a while watching a single Black-tailed Godwit feeding on Ragworms, I can still take photos of birds too!