A possible contender for the film is "The Somme". Not the 1916 one, but the 1927 one: http://www.imdb.com/title/tt0018426/
Footage of Mk V tanks shot for this film regularly appears in documentaries. The battle scenes were shot in Dorset or on Salisbury Plain, depending on whom you believe. http://www.south-central-media.co.uk/prodnhistory.htm
On the other hand, a sequence-by-sequence synopsis of "The Somme" makes no mention of a confrontation with a German A7V. What's more, the Mk Vs in it appear to be in their WWI colour scheme, which was an overall dull brown. The Mk V in the photo has a very much post-WWI camo scheme, which leads me to doubt that it's from the same film.
All of Germany's 20 A7Vs were accounted for. With two exceptions, they were scrapped by the early 20s. Mephisto is, indeed, in Brisbane, and Nixe II was taken to the USA for testing and was eventually shot to pieces for target practice (by 1942, I think). None was used by Poland - that's a myth. The A7V in the photo is clearly a replica.
That's the best I can do. I realise I haven't answered the original question, but I'm still digging.
Regards.