Thank you both for you excellent input.
The Mobilisation manual is very interesting in listing two German companies, thank you Reservist.
The 1899 photograph is likewise very interesting, thank you Leutwin. He appears to wear a British tropical helmet, with the badge as you say, British gaiters and a German dark blue infantry tunic. Yes, it's possibly an "H" on the shoulder strap (as far as I know Kuerassier Regt Nr 6 was the only regualr German army unit to wear an "H" monogram?), very difficult to tell... it doesn't look similar to any imperial German shoulder strap that I know of. Can anyone else make a guess?
The rifle looks very like a British Lee Enflield, though the bayonet knot looks very German...
Anyone else got any thoughts on this amazing photo?
Cheers
Chris
PS I just found this...
"At Shanghai the Europeans built the so-called Shanghai Volunteer Corps (S.V.C.) under British control. Max Hey as an enthusiastic bicyclist, encouraged the formation of a Customs Cyclist Company (C.C.C.) as part of the S.V.C.! This company was wearing British style uniforms made of local khaki fabric and Australian styled hats, the guns and side arms were supplied by the British Army...."
...description of the uniforms of the SVC on the excellent Austro-Hungarian Army website in a biography of Maximillian Hey ( http://www.austro-hungarian-army.co.uk/biog/hey.htm ) it also includes photogrpahs of Hey in SVC uniform.
This description of the hats as "Australian styled" makes sense as the Australians worn hats with the left side pinned up (as seen in the original photo), while the Germans (in the Schutztruppe, Landespolizei and East Asian formations) usually pinned up their hats on the right.