I also have ancestors I think are linked to said John Maynard & Philadephia Lockyer, namely John's parents James Maynard (b.abt.1760 West Malling) & his 2nd wife Sarah Cramp (b.abt.1803 Bodiam, E.Sussex). Please contact me, if you see a link or have Maynards from Horsmonden, Salehurst, Bodiam, Sandhurst - I am part of a large discussion group of distant Maynard-Reeves cousin descendants (USA, Canada, England, Netherlands).
Regards, Jeremy.