Found in grassland area of park.
No interactions present.
A kind of knotgrass by the looks of things. Take a look at photos of Polygonum aviculare
Thanks a lot for the ID tips markwilson and allison_reid99. Definitely is a knotgrass. At moment I would guess the Equal leaved version P. arenastrum just because my book says the P. aviculare has leathery leaves and this didn't. Checking further...
Lat/Lng: 51.591466, -0.127325
OS grid ref: TQ298897