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Answered my own question
Ok, just checked the blue book.
Page 189 of the 2016 BB refers. Belts must not be at an angle to the horizontal greater than 20deg above the horizontal plane but it is recommended only that belts do not exceed an angle of 20 deg below the horizontal plane and should have a max angle downwards of 45 degrees to the horizontal.
The horizontal plane being the line through the seat belt holes in the back rest of the seat.
Hope that makes sense.
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