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The NAMC’s “Catalog of all Series Matchbox Models” (second edition) suggests that there are two different blues: peacock blue and light peacock blue, the latter being exclusively associated with the brown luggage and the former exclusively with the tan.
On the other hand, the AIM's “1-75 Series Regular Wheels” catalogue (second printing, 1983) simply notes "blue body colours vary in shades with all known variations".
Stannard does not list any variations not already listed by Nick. Houghton however, has variation codes 12c-20 and 12c-21 (identical except for the presence/absence of the transmission tunnel) matching Nick's variation code 10 (metallic gold body, black base, tan luggage, long braces, with blocks and tow bracket) but without the tow hook lug. Looking at Nick's table, this is obviously a credible variation.
U.K. Matchbox did not examine the model

There are several unlisted variations:
a) without reinforcement edges (discovered by Jason)
b) opening for tongue in the middle of the bumper
c) opening for tongue above the bumper

The brace above the front wheels:
a) small

b) large with a protrusion

a) dark blue
b) light blue

base plate
a) with middle line and front square lines and rear brace
b) with middle line
c) without middle line

The front rivet could have:
a) small triangular braces
b) large braces

a) with MS silver trim (thin windscreen pillar)
b) without silver trim (thick windscreen pillar)

There are several types of the luggage attachment. You can see it when you turn the luggage by 90°.
Antonin

Diecast wrote:a) with MS silver trim (thin windscreen pillar)
b) without silver trim (thick windscreen pillar)

Didn't Jason (who else would it be?) find a pre-production with a silver grille as well?