Advice needed on brick raised bed construction please

Are there any LJNers who can advise please? I am designing a garden for a client which includes some brick raised beds. One bed is 4m long, the other 2m long. The external depth will be 800mm and was looking at height of 600 or 700mm. I was hoping to get away with a half brick width wall (10cm ish)- but will this be strong enough for weight of soil inside? Is there a maximum height that would be recommended for this type of construction? Also I am I right in thinking I would need them…

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