Don't forget the nearby cross commemorating Maj AW (Alexander William) Hewetson, 66 Battery Royal Field Artillery. He died in a flying accident on 17 Jul 1913 whilst attempting to gain his Flying Certificate in a Bristol-Coanda Monoplane. The cross is in the SE corner of Fargo Plantation at SU113426. An associated plinth is at SU139439 - the site of the accident. I will post photos of both monuments as soon as possible.
It remains to be seen what arrangements for access to the Fargo Plantation monument will exist after work on the new Stonehenge visitor centre is complete - I believe that from that point on only English Heritage vehicles will ordinarily use the erstwhile A344 between Stonehenge and Airman's Cross (sic; surely Airmen's Cross?).
Perhaps a group should "press-to-test" on 17 Jul 14, the 101st anniversary of the death?