Imp tip for those that aren't aware. Classic Rover/austin mini heater from around mid 80s to 1994 fits perfectly in the plenum chamber. I would say that it doesn't even need a bracket (though I will put something in to stop rattles). Tee off from the heater pipes, add another heater valve if you want, Adds a bit of extra cooling capacity for when you need it. These can be picked up for £15-£25 new.
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