HZ Sandman or not ???

[Innuendo]

Please advise if the following is a genuine HZ Sandman;

HZ8WM70
1930 - 67c
568 - 30521
L32, M20, GU4

8M70RJL4- - - - - z
GVW - 2200
4/79

Has the courtesy light buttons on the door frame.
Has twin light front end and yellow needle GTS dash.
Has the full length head lining.

It might be.
Palais White Panel Van with Tan trim 253, 4 speed with a 3.36:1 Salisbury diff.

Having GVM 2200kgs it would have to be a XU3 to be a Sandman which lessen the odds.
Plates are never enough to say if it is a Sandman. You need more proof with things like console brackets, evidence of blackouts etc.
The best proof is paperwork with a traceable timeline.

Based on what you have posted so far you are at less than 50% chance of being Sandman.