That figure is obtained by subtracting the dry weight from the maximum take off weight so it includes crew, fuel and ammunition as well as the bomb load. Seeing as it had the same wing and engine as a Hurricane it was hardly going to carry three times the bomb load as a hurribomber successfully did.
It was more the range and mostly the top speed I was interested in. The bomb load is good enough and carried internally.
EDIT: The wingspan of the Henley is greater than the Hurricane (same outer wing panel, not the whole wing).
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