The Manor Nature Reserve near Harold Hill is owned and managed by London Borough of Havering.
The London Borough of Havering website
Link says:
"This amazing site in Harold Hill which includes Hatters Wood, Fir Wood, Duck Wood and Dagnam Park offers a diversity of different wildlife habitats.
The site includes almost twenty hectares of colourful wildflower meadows, over eight hectares of ancient coppiced woodland, ponds, scrub and veteran trees. Not only that but the site also preserves a fascinating historical record which stretches back into the Middle Ages. Dagnam park, formally laid out by the well known Victorian landscape architect Humphrey Repton, preserves its original 18th century boundaries together with a number of original landscape features including copses, ponds and specimen trees. Look out for mature conifers, horse chestnuts and cedar."
See also:
Natural England:
Link
Magic Map (defra)
Link
Wild Essex:
Link
See other images of The Manor Nature Reserve