Thanks for posting these interesting pics Richard.
I checked the sigvan in my database to find I have a record of the next one in the sequence - here are both of them with close engine numbers too except the later number is in the earlier vehicle:
Quote:
2842100517S PR3857843
2842100518S PR3857842
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WO73 was allocated to the 4X2 version while the C15A Wireless Signals was WO12.