From here you can find information about two Armstrong-Whitworths in Finland:
http://www.jaegerplatoon.net/ARMOURED_CARS1.htm
Note that there is no information about more than those two. I am very sure that there were no more. Car in Tampere was more likely built on Jarrott chassis, because it had only one pair of wheels on rear axle.
Thanks Ivan The soldier in the Germans and Austrians captured 3rd picture in white trousers is most likely Austrian. the soldiers in the 4th photo are most likely Austrian as well judging from the uniforms. In the row RKKA "Communist and Finnland pictures 5 and 7 with the woman in the coat and hat who looks well to do. It looks like theres some graffiti written on the armored car. Can anyone make it out? This could be one the Finns captured.