Quickly after my excitement two birders came walking towards me, one being James Heal from Wanstead who was looking at his phone? Is that your phone James? and before I went in to detail the Quail called again- phew! A scarce bird nationally but a good one for London and therefore twitched by many over it's 3 day stay.
Sadly no images of the Quail unlike the 5 Whimbrel on the same hill that did show quite well.