Tony,
If you want to overcome the winter cold, place the bath on an old electric blanket and plug it in (err, not one you want to put back on the bed!). Works wonders on the action of a caustic bath, too.
When in Aust, I used a metal heat pad, the sort you put under your feet when working at a desk, but I suspect any source of constant, low heat would do the trick.
Mike
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