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Regarding the climate - does it have to be a min of 18 degrees all year? Would the bees be ok with a SA winter?

I am not sure sorry as I am from Brisbane, Queensland but if you check this link out it should have the info you need: http://www.sugarbag.net/

Great thanks for your help - my nephew was considering beekeeping as a hobby

Awesome,its a great idea! There will be a Bee suitable for your area Im sure!