You're welcome Ian,
Here are a couple more links which give a fairly recent idea of the condition of the graveyard.
The second link contains further links (under 'material available') which allow you to determine which is Flt Lt Waghorn's grave:
Bourne Conservation Group's Website
Bourne Conservation Group's Website
Deviating slightly from the thread, here is a silent video of the 1929 race:
http://www.britishpathe.com/video/br.../query/waghorn
and close ups of the S6:
http://www.britishpathe.com/video/35...miles-per-hour
and here is a photo of the funeral procession:
http://www.raf.mod.uk/rafmusic/rafcm...BE3973600F.jpg