The first I think is a common sandpiper by the very white underbelly and plain brown back. I did think a greenshank but I am sure these have more spots. This was in La Palma in Feb 16. The others were in the Norfolk Broads last month. The second , I only know two waders with red legs, a ruff and a redshank, so I think a redshank as the back again is plain. The third is a black tailed godwit. The 4th I am assuming is a BTG also, maybe a juvenile as its underbelly is so white ?