There was a story a couple of weeks ago[0] about pottery dating from around 3600BCE being found at a site in Shoreditch (which was being excavated for the new Amazon HQ), suggesting London may have been inhabited considerably longer than previously thought.

[0] https://www.mola.org.uk/blog/largest-group-early-neolithic-p... & https://www.nature.com/articles/s41586-020-2178-z