A potted (OK, cemented) history of the memorable flood years, recorded on the pillars of the Rothschilds bungalow at Woodwalton Fen:
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Worth getting into an Observation. There MUST be something lurking in there!
All I can identify is Urtica dioica. (12 o’clock and 5 o’clock.)
Give it a couple of months, and Senecio sarracenicus (Broad-leaved Ragwort) will surround the bungalow - it’s one of a couple of exotics introduced by the Rothschilds, persisting but not spreading too far.
Relevant to 
Earth Awareness (GLOBAL)
.
Tried to add an additional photo, but the Gremlins were having none of it:
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Tried again a few hours later. I cannot upload ANY photo to the Forum, it seems.
thanks for the link…
Might this be where you looked https://www.greatfen.org.uk/sites/default/files/2019-10/Woodwalton%20Fen%20Trail%20Guide_The%20Bungalow%20Trail%20%20v3%20BG.pdf
Water Levels at Rothschild's Bungalow © Keith Edkins cc-by-sa/2.0 :: Geograph Britain and Ireland The value of Geograph (the web-site) is not lost on me. Linking these photos IN our own observations (and vice versa) is potentially very valuable.
see - https://www.ispotnature.org/communities/uk-and-ireland/view/observation/778731/ (I’d like to do more)