ScienceDaily (Aug. 14, 2009) — London's oldest timber structure has been unearthed by archaeologists from Archaeology South-East (part of the Institute of Archaeology at University College London). It was found during the excavation of a prehistoric peat bog adjacent to Belmarsh Prison in Plumstead, Greenwich, in advance of the construction of a new prison building. Radiocarbon dating has shown the structure to be nearly 6,000 years old and it predates Stonehenge by more than 500 years.
I haven't seen this reported anywhere else, but to be honest I haven't looked yet.
It looks to be a trackway to make it easy to walk across the bog, there have been others found round the country but the way this reads this is the earliest found.
just because it's old, and cool 