Yes, I'm aware to the details regarding 2/20 London, but on the other hand We do find details of how important it was for General Shea to be and to be known as THE General that Jerusalem surrendered before. I would thought that he would make sure that the keys that were handed to him by the Jerusalem Mayor would be kept with a connection to Shea's name (Actually the keys were handed over to General Watson earlier, but Watson handed them back to the Mayor to be represented to General Shea).
As far as the cooks story You know how many arguments were made over the years on this topic, as can be seen even in the thread you mentioned. As one of the friend's mentioned there It's quite problematic to seriously consider that two soldiers will walk forward to look for water without carts etc.
About the Flag Is there a way to receive a photo from the IWM?
The story about the cooks going looking for water can be accepted at face value. How much water they wanted all depends on what and for whom it was required. It may have been only required for the breakfasts of a few men, and then no cart would be needed.
The detail of the cooks is confirmed by Woodward in his 'Forgotten Soldiers of the First World War'
(published by Tempus, in 2006; ISBN 0 7524 3854 9). He also mentions the sergeants, the two artillery officers and Lt-Col Bayley, etc, etc, etc. Woodward's writing is based upon "...the diary and letter of December 10, 1917, (held at)
IWM, Bayley MSS 86/9/1; and diary, IWM, Chipperfield MSS 75/76/1."
The story of the surrender became complicated because it did not happen at one time and in one place. The events became protracted and involved various people at various locations. Each time an observer may have been mistaken into thinking that the episode which he saw was the only genuine surrender and he may have in good faith, reported it as such.
Although I have not seen the IWM documents myself, I am quite prepared to accept that if they where written just 24 hours after the events, by someone who was actually involved, then they are as accurate as we can expect.
After the cooks, the sergeants and the artillery officers, then "At this point, Lieutenant Colonel H. Bayley, the commander of the 303rd Brigade RFA, 60th Division, appeared on the scene. 'Arriving at the top of the road within sight of the Jewish Hospital in Jerusalem and with my 3 battery commanders I was amazed to see a white flag waving and a man coming towards me. I beckoned him on and speaking in French he said the Mayor of Jerusalem was at the flag... We sat on chairs on the road outside the Jewish Hospital and he informed me the Turks had left Jerusalem during the night retreating toward Jericho...'"
Bayley sent a message to 60th Divisional HQ., and then Brigadier General Watson arrived on the scene. Bayley and Watson went to the Jaffa Gate, where they were joined by General Shea: the latter, "unhappy that he had been upstaged by Watson, repeated the surrender ceremony, only to be informed by Allenby that the honor of receiving the surrender belonged to him."
Centurion is quite correct in reminding us that as often as not, the 'keys' of a city are merely symbolic, and do not in fact fit any real lock.
Regarding the picture of a portion of the flag to which I refered previously; as soon as I can re-connect my scanner (hopefully, later today) then I will see if I can get a copy to you