Growing in a damp, wooded area at the edge of the park.
No interactions present.
Leaf shape (pointed tip), yellow male catkins and tiny red female flowers suggest Hazel to me
I found the tiny female flower fascinating. The male catkins still confuse me.
Once I had the name I was able to find more about the female catkins in Wikipedia:
A lichen ménage à trois - http://science.sciencemag.org/content/353/6297/337
Some say it's time to throw the textbook understanding of lichens out the window.
"Now there will be more chaos, more confusion in lichenology ,...."
Lat/Lng: 51.4935, -0.0143
OS grid ref: TQ379790
Near the entrance at the western side of the park.