Using 9" retaining wall to build garden room

Does that mean a void behind the retaining wall? The intention is to back fill it once the wall is made so there should be no soil movement.

Unless I've misunderstood what you're saying?
No. The horizontal DPC bedded onto the wall will be a slip point and a no-no, regards retaining.
 
Something like this would be more suitable, in principle, except add another block width to the bottom so the wall is stepped in width as you go down to your 1.5m depth.

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