What sort of reed is this rather robust looking plant?
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... are quite a good ID feature.
Apparently the foliage smells of oranges or tangerines when crushed.
Did you get a chance to crush the foliage?
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 51.2028, -0.7559
OS grid ref: SU870455