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Photo not good but you may have an interesting fungus - one of the Birds' Nest fungi!
Can you try and get better photos please?
The more I know the more I realise I don't know
Same thought Mark I have tried it on full image but too burred worth getting a side photo too showing the shape of the cup.
Lat/Lng: 51.5155, -0.0283
OS grid ref: TQ369814