Could this be a brief wall cloud or something more mundane?

[poseidon]

Took these pictures on Sunday in Cambridgeshire. In the right of the images there is large Cb, which is a bit obscured on the photos and not fully shown - it did not produce any lightning to my knowledge. It's more visible in the first shot. Progressing through the shots you can notice what looks like a dark lowering under the cloud in the centre of the image (above the aeroplane in the first shot). I noticed that there was a fair amount of movement associated with the lowering as you can see in the final shot.

 

My question is could this be a brief wall cloud, even though the Cb did not develop into a proper thunderstorm? Or is it [more likely] a small flanking line, inflow, scud etc?

 

Interested in any comments/observations. What processes may be occurring here?

 

[Had to chop some of the pics to take the crowd out]

 

Edited September 10, 2013 by poseidon

[Paul]

Something more mundane I think, but great photos nonetheless!