ford_gpw_75342.jpg
I was eventually able to identify this vehicle through an online brochure for another event which listed the vehicle under its civilian registration. 
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Richard J Kyte Photography > Events>
Wartime in the Vale 2017
wartime_in_the_vale_2017004001.gif
Ford GPW (BNK 276A/525M1BDE), Wartime in the Vale 2017, 
18th June, 2017
(P75342)
Image Width: 4608
Image Length: 3072
Bits Per Sample: 722
Samples Per Pixel: 1
X Resolution: 350 (Units)
Y Resolution: 350 (Units)
Resolution Unit: inch
Orientation: 1
Date and time of image creation: 2017:06:23 14:28:27
Make: SONY
Model: DSLR-A550
Software: PaintShop Pro 16.00////////////////////
Copyright: Richard J. Kyte
Exif Version: 2.21
FlashPix Version: 1.00
Color Space: sRGB
Components Configuration: Y,Cb,Cr
Compressed Bits Per Pixel: 8 (bit/pixel)
Pixel X Dimension: 750
Pixel Y Dimension: 500
User Comments:
Date and time (original): 2017:06:18 13:59:42
Date and time (digitized): 2017:06:18 13:59:42
Exposure Time: 1/640 (sec)
F number: 6.3
Exposure Program: Aperture priority
ISO Speed Ratings: 200
Brightness Value: 862 (APEX)
Exposure Bias Value: 0 (APEX)
Max Aperture Value: 464 (APEX)
Metering Mode: Pattern
Light Source: Other
Flash: None
Focal Length: 50mm
File Source: DSC
Scene Type: 1
Custom Rendered: 0
Exposure Mode: 0

White Balance: 1
Focal Length In 35mm Film: 75
Scene Capture Type: 0
Contrast: 0
Saturation: 0
Sharpness: 0

RAW rework
Recomposed, lighting adjustments and sharpened in PSP.