https://www.krause-systems.co.uk/krauseproducts/detail/product/7845-multipurpose-rung-ladder-tribilo-3x9-rungs.html
I'm sure you could get something good second hand, but I couldn't here. Been up 8m and felt very stable on it. Wasn't cheap but will last a lifetime.
Ta!
@skinny started
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https://www.krause-systems.co.uk/krauseproducts/detail/product/7845-multipurpose-rung-ladder-tribilo-3x9-rungs.html
I'm sure you could get something good second hand, but I couldn't here. Been up 8m and felt very stable on it. Wasn't cheap but will last a lifetime.