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Notice especially that wide creamy supercilium and the dark moustachial streak, coupled with the stripy back. Aquatic Warbler is a confusion species but you're very, very unlikely to see one of those. If you do, the most obvious features would be a well-defined pale central crown-stripe, two straw-coloured 'tramlines' on the mantle and pale lores (this is the bit immediately in front of the eye, which is dark on your Sedgie). Aquatics also often look distinctly yellower overall than Sedge.
I particularly like the background on your photos!