Hi Ivanhoe,
I don't have these chairs or any John Eden figures.
However, I'm rather sure that the chairs are too large.
The John Eden figures are in the 54mm or 1/32 scale.
Since the chairs are from King & Country I would assume that any sitting John Eden figures would look like "children".
Like with their legs dangling in the air and their back not reaching the back of the chair.
Konrad