The key to reconstructing the pattern is the photos of the test Mustang Mk.I, AM106 of the Ducimus book
listed below. This machine is in this pattern, and the photos give both sides plus the wing pattern. 
Also see the photo of 5J-A in the same book for a better look at the Port wing pattern.

I have now found photos of Allison engined a/c, Mk.IIIs, Mk.IVs and even the RAF P-51F in this pattern 
which appears to be reasonably common in the UK. It is not however the most common pattern (of which 
there seems to be several) seen in available photos of U.K Mustangs.

The following list is some of the examples that I have found (there are others, particularly on the 
Allison engined a/c not listed below).

Ducimus Cam & Markings, RAF Northern Europe, booklet #2 (circa about 1970).
Mustang Mk.I, AM106 on P.42,43
126 Sqn 5J-A on P.47
Several other Allison machines including the 3 view on P.28
The RAF P-51F on P.47

Osprey Aircraft Aces # 7
93 Sqn DV-I? on P.21

Aircam # 3
315 Sqn SZ-L on P.5
303 Sqn a/c (nose only) on P.4

Mustang at War (Ian Allan)
Allison Mustang on P.35 (large photo)
AL386 'P' 'Lucky Lady' on P.37
126 Sqn 5J-I KH521 on P.120
W/C Skalki's 'SS' on P.122
The 65 Sqn Mk.IVs on P.126

Osprey Aircraft Aces # 21
303 Sqn PD-L on P.75 & Drawing 50
W/C Skalki's 'SS' on P.69 & Drawing 40 (see note below)
W/C Nowierski's 'TN' on Drawing 45

Note: The photo on P.69 confirms that Skalki's aircraft has the unusual layout of the Starboard
wing pattern associated with this scheme. Thus unless he either had two different aircraft or it
was repainted (which I doubt), the profile # 40 has an incorrect pattern. It should be like
Nowierski's aircraft in profile # 46.