RNAS losses 10th August 1915

I am interested in the story behing the shooting down of David Keith Johnston at Ostend on 10th August 1915, and have read the posts by Regulus, Soderbaum, Frank, errol and tirpitzbe here on 28th February/1st March 2002.
Can anyone direct me to the full story? tirpitzbe says "There exists a picture".
Was David attacking the Luftschiff?
Was his the plane shot down at 11.45?
If so, what was happening during the 5.5-hour gap from 06.15 when the airship was reported as coming down and and 11.45?
Regulus says "Rescue was not possible". We are fairly sure David was buried with honour by the Germans - we have a headstone. Are there any web-accessible records of this?

Many thanks for any information on this.

[Graeme]

cchd

L12 was hit by shrapnel from ten rounds fired from a 3-inch gun near Dover and settled on the water in the Channel (reportedly at 03:40) on 10 August. The airship was taken in tow by a torpedo boat and when about three miles off Ostende it came under attack from Flight Commander J R W Smyth-Pigott who dropped two 20-lb bombs and six grenades, apparently breaking the airship's back.

At around noon, when alongside the quay in Ostende, the airship was attacked by a number of aircraft, one of these being the Farman flown by Flight Lieutenant D K Johnston who failed to return.

A picture of the airship in the harbour with its back broken is at:

http://1914-1918.invisionzone.com/fo...pic=38389&st=0

The airship was destroyed by an explosion in the afternoon as the nose section was being lifted clear of the water.

Graeme