I thought perhaps just a chance of Sedge Warbler singing in the old sewage beds, now overgrown with a small area of phragmites along with willows etc. No sight or sound of a 'sedgie' though some of the habitat looks ok - if you could see and get close enough.
2 Garden Warblers singing along with 4 Blackcap, 4+ Willow Warblers, 1 Chiff-chaff, Great-spotted Woodpecker and Nuthatches.
No Swallows or House Martins and just 2 Swifts
Plenty Orange-tip Butterflies along the canal