Warbler ID help please

Small warbler difficult to see clearly due to moving around in foliage. Tried some shots with my camera and managed to get 3 images though not ideal. Main points are the very long & thin supercilium and the somewhat blotchy ear coverts, though not visible on photos, very brief binocular views showed a single rather thin wing bar. A nearby Yellow-browed Warbler was more successfully photographed! Have been in discussion about most likely species, but need some further thoughts before confirming. Photograph taken in Suffolk on 20th September.