Indian Bean tree pruning

I've heard that Indian Bean Trees grow larger leaves if pruned back hard. Can anyone advise as to how and when to prune them please?

 

I prune mine in autumn as the leaves are falling.
You need to establish a bush or standard type of tree.
It involves cutting back the current seasons growth to a couple of buds, which sprout next spring and grow like the clappers with massive leaves.

 

Thanks Pete. They've got quite leggy this year so they do need a good tidy up anyway. I was just a bit scared I'd do it wrong and wreck them.