I like the general look of that bike, with that protective layer of mud...
email (option): viaconsu [at] planet [dot] nl
Hi John,
I didn't even notice that mudguard. I did find an other photo of such a mudguard and it could very well be the same bike.
Henk
email (option): ahum@quicknet.nl
Yes it's the same bike..a close examination of the two pictures shows some common features..Ian
email (option): ian@wright52.plus.com
Do you mean the mudguard? 
email (option): ahum@quicknet.nl
Well, the front tip of the mudguard appears to be turned up to the same degree on both bikes which you might not expect on more than one roughly made up item. The corner of the blackout mask has the white paint rubbed off it..you can see this in both photos. The rider has a pouch of some description on his DR coats belt..this can also be seen in both photos. Also he has the back of his coat collar turned up..but not the front, quite clear in both pictures also....Ian
email (option): ian@wright52.plus.com
And there is a mark in the paint under the 'C' of the tank number which can be seen in both pictures...Ian
email (option): ian@wright52.plus.com
And inside the tent, is that the rear end of a signals 3 tonner
Could it be a Bedford ?
The top part of a '5' is just visible to the left of the tent pole and the spacing doesn't allow for a wide second digit.
L5130451 seems the only likely option and sure enough, it falls within the range L5130220 - L5130519 of contract S1338 - Bedford, Lorry, 3-ton 4x4 Wireless
Great minds, over the five, I thought it might have been an OYD, did not think of a QL Radio, would be nice to see it from another angle.
It's an IWM photograph from a series showing 11th Armoured Division. There are no others on line showing the wireless body but the M20 appears again.
It may well be that there is another image showing more of the lorry in the IWM library.