BonsaiMon

Ross .. I'll have to differ with Colin on the pruning on the Benjamina. From the looks of the last pic there isn't much foliage on it as is. Benj. do not like hard pruning in your neck of the woods at this time of year. Tip pruning .. in the conditions stated will shock it also. If it were mine .. I'd leave it unpruned til spring/summer.
Getting it into a smaller pot will be stress enough. If you do more it to another container it would be good to keep the root mass with the help of a heat pad between 60-70F. How cool does your room get?
The Benj does have larger leaves but in time and lots of light .. full sun.. they will reduce somewhat .. half their current size...
A 4' shop light a few inches over the trees with a warmwhite tube and a coolight will help with the light and not be that expensive.
The work you have done so far has brought it into a workable state to become a nice tree. Given some time and root heat this winter will help this Benj. become the tree it wants to be..

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peace,
tom stoute

http://bonsaiinsights.spaces.live.com/