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It wouldn't be a ply floor it would be a floorboard floor! You'd just need something to bring it up to level. I'm no fan of 6mm ply either, but you wouldn't be relying on its strength, it would basically act like a packer between the boards and the joists. You could use 6mm Hardiebacker if you were worried about it not being tough enough.
Fox
Haaaa. Yeah so I’m not sure I fancy a ply floor, I did once, now less so. Need to check your boards still obvs but other option is 18mm ply + glue down cork to get it to 24mm which is the difference between the two.