I found this by chance while seeking pictures of old petrol tins:
http://www.diggerhistory.info/pages-arm ... st-ww1.htm
It may be well known to some of you, but it was new to me.
Useful for any of you Rolls Royce enthusiasts.....
Those are good photos, but I find the watermark rather obscures the subject matter.
If you go to the source, the AWM's website, you can do a collection search. Type 'Rolls Royce' as the key words and restrict the search to 'first world war' and you get quite a few photos of the magnificent beast, none of which are so marred by the watermark (but carry it more discretely in the bottom corner).