Thanks, Mike.
As printmeister and others have pointed out, one of the problems of the Bristol Road theory is the question of shadows.
My addled brain has been trying to recall geography lessons of too long ago. I'm right in saying (aren't I?) that the sun takes 12 hours to move 180 degrees. Printmeister's photo was taken at 3.30 p.m. in the winter. In midsummer 1940 we were on standard BST = 1 hour in advance (Double BST didn't come in until 1941). So in 1940 terms the new photo was taken at 4.30 p.m.
I reckon the difference in shadow between the two photos is 110-120 degrees, which means a 7.5 - 8 hour difference. So, if this IS the Bristol Road, Mr. Godsall and his blokes must have neen parading early, at 8.30 - 9.00 a.m. - which makes it all just about feasible.
I think the above arithmetic and logic are correct, but do the shadows on the earlier pic look right for that time of the morning? Is the slope difference in the road accounted for entirely by the cameraman's elevation? (It seems he was standing on the top of a car or truck). And/or the possible use of a slightly telescopic lens. And I still have the other problem - several people remain convinced about the Tyburn Road and my own information (from 1943 and I believe to be accurate although it's just conceivable that it isn't) puts this group firmly in the Aston/Erdington area in 1940.
It has been pointed out that there is a small, (possibly) road sign in the hedge beyond the reviewing party but again, blow it, that's illegible.
I think we are reaching the stage of flogging this one to death and I don't want to bore everyone; but if anyone has any final thoughts.....
Chris